In pictures: Russia invades Ukraine

After months of military buildup and brinkmanship, Russia launched an unprecedented assault on Ukraine in late February.

Explosions rang through a number of Ukrainian cities, including the capital Kyiv, in a broad invasion that began before dawn on February 24. Fighting continues to take place throughout the country, and so far the Ukrainian resistance has been able to hold Kyiv and many other key cities.

Meanwhile, more than 4.5 million refugees have fled Ukraine to neighboring countries, according to the United Nations’ refugee agency.

The United States, the European Union and other Western allies have been rolling out sanctions in response to Russia’s actions. Many people around the world have also been rallying in support of Ukraine.

Russia had been tightening its military grip around Ukraine since last year, amassing tens of thousands of soldiers, as well as equipment and artillery, on its neighbor’s doorstep. The escalation in the years-long conflict has triggered the greatest security crisis in Europe since the Cold War, and it has also sparked an intense showdown between Western powers and Moscow.

Editor’s note: This gallery contains graphic images. Viewer discretion is advised.

Ukrainian forces fire rockets toward Russian positions in Ukraine’s Donbas region on Sunday, April 10. Fighting has been intensifying in the east of the country.Wolfgang Schwan/Anadolu Agency/Getty Images

A man lays flowers at a railway station in Kramatorsk, Ukraine, on Saturday, April 9. At least 50 people were killed after Russian forces carried out a missile strike on the railway station, Ukrainian officials said. They said the station was being used by civilians trying to flee the fighting.Andrea Carrubba/Anadolu Agency/Getty Images

A man on Wednesday, April 6, works to catalog some of the bodies of civilians who were killed in and around Bucha, Ukraine. Shocking images showing the bodies of civilians scattered across the streets of Bucha, a suburb of Kyiv, sparked international outrage and raised the urgency of ongoing investigations into alleged Russian war crimes. Ukrainian President Volodymyr Zelensky called on Russian leaders to be held accountable for the actions of the nation’s military. The Russian Ministry of Defense, without evidence, claimed the extensive footage of Bucha was “fake.”Chris McGrath/Getty Images

Search and rescue teams remove debris after the Ukrainian army regained control of Borodianka, Ukraine, on April 6.Wolfgang Schwan/Anadolu Agency/Getty Images

People wait to board a train as they flee Kramatorsk on April 5.Fadel Senna/AFP/Getty Images

Destruction is seen in Borodianka, Ukraine, on April 5. Borodianka was home to 13,000 people before the war, but most fled after Russia’s invasion. What was left of the town, after intense shelling and devastating airstrikes, was then occupied by Russian forces.Matthew Hatcher/SOPA Images/Sipa USA/AP

Ukrainian President Volodymyr Zelensky speaks to the media about the alleged atrocities in Bucha on April 4. “It’s very difficult to negotiate when you see what (the Russians) have done here,” Zelensky emphasized as he stood in the town, surrounded by security.Ronaldo Schemidt/AFP/Getty Images

Anna Zhelisko touches the casket of her grandson, Ukrainian soldier Dmitry Zhelisko, as it arrives for his funeral in Chervonohrad, Ukraine, on April 3. He died fighting the Russian army near the town of Kharkiv. Joe Raedle/Getty Images

Smoke rises over Odesa, Ukraine, on April 3. The Russian defense ministry confirmed a strike on an oil refinery and fuel storage facilities in the port city.Petros Giannakouris/AP

Bodies lie on a street in Bucha on April 2. Images captured by Agence France-Presse showed at least 20 civilian men dead.Ronaldo Schemidt/AFP/Getty Images

A Ukrainian serviceman stands with a handcuffed Russian soldier in Kharkiv on March 31.Fadel Senna/AFP/Getty Images

A satellite image shows a shelled warehouse that was being used by the Red Cross in Mariupol, Ukraine, on March 29. Maxar Technologies

Russian and Ukrainian delegations meet in Istanbul for talks on March 29. Russia said it would “drastically reduce” its military assault on the Ukrainian cities of Kyiv and Chernihiv. The announcement came after Ukrainian and Western intelligence assessments recently suggested that Russia’s advance on Kyiv was stalling. The talks also covered other important issues, including the future of the eastern Donbas region, the fate of Crimea, a broad alliance of security guarantors and a potential meeting between Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky.Arda Kucukkaya/Anadolu Agency/Getty Images

A woman named Julia cries next to her 6-year-old daughter, Veronika, while talking to the press in Brovary, Ukraine, on March 29.Rodrigo Abd/AP

The regional government headquarters of Mykolaiv, Ukraine, is damaged following a Russian attack on March 29. At least nine people were killed, according to the Mykolaiv regional media office’s Telegram channel.Petros Giannakouris/AP

An armored convoy of pro-Russian troops travel on a road leading to Mariupol on March 28.Alexander Ermochenko/Reuters

A volunteer weaves a bulletproof vest in Zaporizhzhia, Ukraine, on March 28.Diego Herrera Carcedo/Anadolu Agency/Getty Images

A woman lights a candle during the Sunday service at a monastery in Odesa on March 27.Sedat Suna/EPA-EFE/Shutterstock

A Ukrainian serviceman stands in a heavily damaged building in Stoyanka, Ukraine, on March 27.Vadim Ghirda/AP

Orphaned children travel by train after fleeing the Russian-controlled town of Polohy, Ukraine, on March 26.Chris McGrath/Getty Images

A man recovers items from a burning shop following a Russian attack in Kharkiv on March 25.Felipe Dana/AP

Ukrainian President Volodymyr Zelensky addresses world leaders via video at the NATO summit in Brussels, Belgium, on March 24. Zelensky stopped short of issuing his usual request for a no-fly zone, but he did say Ukraine needs fighter jets, tanks and better air defenses.Denzel/Bundesregierung/Getty Images

A child holds a Ukrainian flag in front of the Taras Shevchenko monument as members of the Ukrainian National Guard band perform in Lviv, Ukraine, on March 24.Pavlo Palamarchuk/Reuters

A firefighter sprays water inside a house that was destroyed by shelling in Kyiv on March 23.Vadim Ghirda/AP

Svetlana Ilyuhina looks at the wreckage of her home in Kyiv following a Russian rocket attack on March 23. “First there was smoke, and then everything went black,” she said.Ivor Prickett/The New York Times/Redux

Pictures lie amid the rubble of a house in Kyiv on March 23.Serhii Nuzhnenko/Reuters

A woman cleans up a room March 21 in a building that was damaged by bombing in Kyiv.Vadim Ghirda/AP

The Retroville shopping mall is seen in Kyiv after Russian shelling on March 21.Emin Sansar/Anadolu Agency/Getty Images

People share dinner and sing “Happy Birthday” during a celebration in Kyiv on March 20. This studio space has turned into a bomb shelter for approximately 25 artists who are volunteering to help the war effort. Chris McGrath/Getty Images

Former Ukrainian Parliament member Tetiana Chornovol, now a service member and operator of an anti-tank guided missile system, examines a Russian tank she destroyed in a recent battle in the Kyiv region.Gleb Garanich/Reuters

A Ukrainian serviceman stands among debris after shelling in a residential area in Kyiv on March 18. Aris Messinis/AFP/Getty Images

US President Joe Biden holds a virtual meeting with Chinese President Xi Jinping in this photo that was released by the White House on March 18. Biden sought to use the 110-minute call to dissuade Xi from assisting Russia in its war on Ukraine.White House Photo

Staff members attend to a child at a children’s hospital in Zaporizhzhia on March 18.Dmytro Smolyenko/Ukrinform/NurPhoto/Reuters

Russian President Vladimir Putin attends a rally at a stadium in Moscow on March 18. Speaking from a stage in front of a banner that read “for a world without Nazism,” Putin said Russia “will definitely implement all our plans” in Ukraine. He insisted that national unity was the strongest in a long time, even as many people flee Russia or protest against war in the streets. State workers were told by authorities to attend the celebration, which commemorated the eighth year of Russia’s annexation of Crimea.ALEXANDER VILF/POOL/AFP/Getty Images

Ukrainian President Volodymyr Zelensky receives a standing ovation as he virtually addresses the US Congress on March 16. The historic speech occurred as the United States is under pressure to provide more military assistance to the embattled country.Drew Angerer/Pool/AFP/Getty Images

An elderly woman is helped by police officers after she was rescued from an apartment that was hit by shelling in Kyiv on March 15.Felipe Dana/AP

Firefighters work to extinguish flames at an apartment building in Kyiv on March 15.Felipe Dana/AP

Military cadets attend a funeral ceremony at a church in Lviv on March 15. The funeral was for four of the Ukrainian servicemen who were killed during an airstrike on the Yavoriv military base near the Polish border. Local authorities say 35 people were killed.Bernat Armangue/AP

A woman walks past a damaged window to lay flowers at a makeshift memorial for victims in Donetsk, Ukraine, on March 15.Alexander Ermochenko/Reuters

Ukrainian soldiers take cover from incoming artillery fire in Irpin, Ukraine, on March 13.Felipe Dana/AP

A Ukrainian soldier surveys a destroyed government building in Kharkiv on March 13.Alex Lourie/Redux

A mother and son rest in Lviv, Ukraine, while waiting to board a train to Poland on March 12.Dan Kitwood/Getty Images

An explosion is seen at an apartment building in Mariupol on March 11. The city in southeastern Ukraine has been besieged by Russian forces.Evgeniy Maloletka/AP

Mariana Vishegirskaya’s husband, Yuri, holds their newborn daughter, Veronika, at a hospital in Mariupol on March 11. Vishegirskaya survived the maternity hospital bombing in the city earlier in the week.Evgeniy Maloletka/AP

People pay their respects during a funeral service for three Ukrainian soldiers in Lviv on March 11. Senior Soldier Andrii Stefanyshyn, 39; Senior Lt. Taras Didukh, 25; and Sgt. Dmytro Kabakov, 58, were laid to rest at the Saints Peter and Paul Garrison Church. Even in this sacred space, the sounds of war intruded: an air raid siren audible under the sound of prayer and weeping. Yet no one stirred. Residents are now inured to the near-daily warnings of an air attack.Valeria Ferraro/SOPA Images/Sipa USA/AP

Russian Foreign Minister Sergey Lavrov gives a news conference after meeting with Ukrainian Foreign Minister Dmytro Kuleba in Antalya, Turkey, on March 10. Two weeks into Russia’s invasion of Ukraine, Lavrov falsely claimed that his country “did not attack” its neighbor.Ozan Kose/AFP/Getty Images

A resident takes shelter in a basement in Irpin on March 10. Due to heavy fighting, Irpin has been without heat, water or electricity for several days.Aris Messinis/AFP/Getty Images

Emergency workers carry an injured pregnant woman outside of a bombed maternity hospital in Mariupol on March 9. The woman and her baby later died, a surgeon who was treating her confirmed. The attack came despite Russia agreeing to a 12-hour pause in hostilities to allow refugees to evacuate.Evgeniy Maloletka/AP

Dead bodies are placed into a mass grave on the outskirts of Mariupol on March 9. With overflowing morgues and repeated shelling, the city has been unable to hold proper burials.Evgeniy Maloletka/AP

Cars drive past a destroyed Russian tank as civilians leave Irpin on March 9. A Ukrainian official said lines of vehicles stretched for miles as people tried to escape fighting in districts to the north and northwest of Kyiv.Vadim Ghirda/AP

Ukrainian President Volodymyr Zelensky is displayed on a screen as he addresses British lawmakers via video on March 8. “We will not give up and we will not lose. We will fight until the end at sea, in the air. We will continue fighting for our land, whatever the cost,” he said in his comments translated by an interpreter. The House of Commons gave Zelensky a standing ovation at the end of his address.Jessica Taylor/UK Parliament/AP

A firefighter works to extinguish flames after a chemical warehouse was reportedly hit by Russian shelling near Kalynivka, Ukraine, on March 8.Chris McGrath/Getty Images

Members of the Red Cross help people fleeing the Kyiv suburb of Irpin on March 7.Aris Messinis/AFP/Getty Images

The dead bodies of civilians killed while trying to flee are covered by sheets in Irpin on March 6. CNN determined they were killed in a Russian military strike.Diego Herrera Carcedo/AP

Civilians seek protection in a basement bomb shelter in Kyiv on March 6.Alex Lourie/Redux

Local residents help clear the rubble of a home that was destroyed by a suspected Russian airstrike in Markhalivka, Ukraine, on March 5.Marcus Yam/Los Angeles Times/Getty Images

George Keburia says goodbye to his wife and children as they board a train in Odesa on March 5. They were heading to Lviv.Salwan Georges/The Washington Post/Getty Images

A statue is covered in Lviv on March 5. Residents wrapped statues in protective sheets to try to safeguard historic monuments across the city.Daniel Leal/AFP/Getty Images

Ukrainians crowd under a destroyed bridge as they try to flee across the Irpin River on the outskirts of Kyiv on March 5.Emilio Morenatti/AP

Marina Yatsko runs behind her boyfriend, Fedor, as they arrive at the hospital with her 18-month-old son, Kirill, who was wounded by shelling in Mariupol on March 4. Medical workers frantically tried to save the boy’s life, but he didn’t survive.Evgeniy Maloletka/AP

People remove personal belongings from a burning house after shelling in Irpin on March 4.Aris Messinis/AFP/Getty Images

Oksana and her son Dmytro stand over the open casket of her husband, Volodymyr Nezhenets, during his funeral in Kyiv on March 4. According to the Washington Post, he was a member of Ukraine’s Territorial Defense Forces, which is comprised mostly of volunteers.Timothy Fadek/Redux for CNN

People crowd on a platform as they try to board a westbound train in Kyiv on March 4.Timothy Fadek/Redux for CNN

A bullet-ridden bus is seen after an ambush in Kyiv on March 4.Emilio Morenatti/AP

People take shelter on the floor of a hospital during shelling in Mariupol on March 4.Evgeniy Maloletka/AP

A member of the Ukrainian military gives instructions to civilians in Irpin on March 4. They were about to board an evacuation train headed to Kyiv.Chris McGrath/Getty Images

Surveillance camera footage shows a flare landing at the Zaporizhzhia nuclear power plant in Enerhodar, Ukraine, during shelling on March 4. Ukrainian authorities said Russian forces have “occupied” the power plant.Zaporizhzhya NPP/YouTube/Reuters

A Ukrainian child rests on a bed at a temporary refugee center in Záhony, Hungary, on March 4.Attila Kisbenedek/AFP/Getty Images

A residential building destroyed by shelling is seen in Borodyanka, Ukraine, on March 3. Russian forces have shown a “willingness to hit civilian infrastructure on purpose,” a senior US defense official told reporters.Maksim Levin/Reuters

Leos Leonid recovers at a hospital in Kyiv on March 3. The 64-year-old survived being crushed when an armored vehicle drove over his car. Video of the incident was widely shared on social media.Timothy Fadek/Redux for CNN

A Ukrainian soldier carries a baby across a destroyed bridge on the outskirts of Kyiv on March 3.Timothy Fadek/Redux for CNN

Residents react in front of a burning building after shelling in Kharkiv on March 3.Sergey Bobok/AFP/Getty Images

A Ukrainian soldier who says he was shot three times in the opening days of the invasion sits on a hospital bed in Kyiv on March 3.Timothy Fadek/Redux for CNN

People form a human chain to transfer supplies into Kyiv on March 3.Diego Herrera/Europa Press/Getty Images

A cemetery worker digs graves for Ukrainian soldiers in Kyiv on March 3.Timothy Fadek/Redux for CNN

A mother cares for her two infant sons in the underground shelter of a maternity hospital in Kyiv on March 3. She gave birth a day earlier, and she and her husband haven’t yet decided on names for the twins.Timothy Fadek/Redux for CNN

A member of Ukraine’s Territorial Defense Forces sits with a weapon in Kyiv on March 2.Mikhail Palinchak/Reuters

Paramedics treat an elderly woman wounded by shelling before transferring her to a hospital in Mariupol on March 2.Evgeniy Maloletka/AP

Residents of Zhytomyr, Ukraine, work in the remains of a residential building on March 2. The building was destroyed by shelling.Viacheslav Ratynskyi/Reuters

A woman reads a story to children while they take shelter in a subway station in Kyiv on March 2.Timothy Fadek/Redux for CNN

A member of Ukraine’s Territorial Defense Forces inspects damage in the backyard of a house in Gorenka on March 2.Vadim Ghirda/AP

A Ukrainian woman takes her children over the border in Siret, Romania, on March 2. Many Ukrainians are fleeing the country at a pace that could turn into “Europe’s largest refugee crisis this century,” the United Nations Refugee Agency said.Andrei Pungovschi/Bloomberg/Getty Images

Militia members set up anti-tank barricades in Kyiv on March 2.Timothy Fadek/Redux for CNN

People wait at a train station in Kyiv on March 2.Murat Saka/dia images/Getty Images

People shelter in a subway station in Kyiv on March 2.Timothy Fadek/Redux for CNN

Ukrainian President Volodymyr Zelensky poses for a picture in a Kyiv bunker after an exclusive interview with CNN and Reuters on March 1. Zelensky said that as long as Moscow’s attacks on Ukrainian cities continued, little progress could be made in talks between the two nations. “It’s important to stop bombing people, and then we can move on and sit at the negotiation table,” he said.Umit Bektas/Reuters

An explosion is seen at a TV tower in Kyiv on March 1. Russian forces fired rockets near the tower and struck a Holocaust memorial site in Kyiv hours after warning of “high-precision” strikes on other facilities linked to Ukrainian security agencies.Carlos Barria/Reuters

Ukrainian soldiers attend Mass at an Orthodox monastery in Kyiv on March 1.Raphael Lafargue/Abaca/Sipa/AP

Medical workers show a mother her newborn after she gave birth at a maternity hospital in Mariupol on March 1. The hospital is now also used as a medical ward and bomb shelter.Evgeniy Maloletka/AP

An administrative building is seen in Kharkiv after Russian shelling on March 1. Russian forces have scaled up their bombardment of Kharkiv, Ukraine’s second-largest city.Sergey Dolzhenko/EPA-EFE/Shutterstock

Ukrainian emergency workers carry a body of a victim following shelling that hit the City Hall building in Kharkiv on March 1.Pavel Dorogoy/AP

A woman named Helen comforts her 8-year-old daughter, Polina, in the bomb shelter of a Kyiv children’s hospital on March 1. The girl was at the hospital being treated for encephalitis, or inflammation of the brain.Timothy Fadek/Redux for CNN

Ukrainian refugees try to stay warm at the Medyka border crossing in Poland on March 1.Visar Kryeziu/AP

Volunteers in Kyiv sign up to join Ukraine’s Territorial Defense Forces on February 28.Timothy Fadek/Redux for CNN

A member of the Territorial Defense Forces loads rifle magazines in Kyiv on February 28.Timothy Fadek/Redux for CNN

Delegations from Russia and Ukraine hold talks in Belarus on February 28. Both sides discussed a potential “ceasefire and the end of combat actions on the territory of Ukraine,” Ukrainian presidential adviser Mikhaylo Podolyak told reporters. Without going into detail, Podolyak said that both sides would return to their capitals for consultations over whether to implement a number of “decisions.”Alexandr Kryazhev/Sputnik/AP

A displaced Ukrainian cradles her child at a temporary shelter set up inside a gymnasium in Beregsurány, Hungary, on February 28.Akos Stiller/Bloomberg/Getty Images

Ukrainian forces order a man to the ground on February 28 as they increased security measures amid Russian attacks in Kyiv.Aytac Unal/Anadolu Agency/Getty Images

The lifeless body of a 6-year-old girl, who according to the Associated Press was killed by Russian shelling in a residential area, lies on a medical cart at a hospital in Mariupol on February 27. The girl, whose name was not immediately known, was rushed to the hospital but could not be saved.Evgeniy Maloletka/AP

Smoke billows over the Ukrainian city of Vasylkiv, just outside Kyiv on February 27. A fire at an oil storage area was seen raging at the Vasylkiv Air Base.Dimitar Dilkoff/AFP/Getty Images

People wait on a platform inside the railway station in Lviv on February 27. Thousands of people at Lviv’s main train station attempted to board trains that would take them out of Ukraine.Bernat Armangue/AP

A Russian armored vehicle burns after fighting in Kharkiv on February 27. Street fighting broke out as Russian troops entered Ukraine’s second-largest city, and residents were urged to stay in shelters and not travel.Marienko Andrew/AP

Local residents prepare Molotov cocktails in Uzhhorod, Ukraine, on February 27.Serhii Hudak/Reuters

Cars line up on the road outside Mostyska, Ukraine, as people attempt to flee to Poland on February 27.Natalie Thomas/Reuters

Ukrainian troops in Kyiv escort a prisoner February 27 who they suspected of being a Russian agent.Efrem Lukatsky/AP

Ukrainian forces patrol mostly empty streets in Kyiv on February 27. Mayor Vitali Klitschko extended a citywide curfew.Aris Messinis/AFP/Getty Images

Ukrainian service members take position at the Vasylkiv Air Base near Kyiv on February 27.Maksim Levin/Reuters

A woman sleeps on chairs February 27 in the underground parking lot of a Kyiv hotel that has been turned into a bomb shelter.Vadim Ghirda/AP

An apartment building in Kyiv is seen after it was damaged by shelling on February 26. The outer walls of several apartment units appeared to be blown out entirely, with the interiors blackened and debris hanging loose. Daniel Leal/AFP/Getty Images

People in Kyiv take cover as an air-raid siren sounds February 26 near an apartment building that was damaged by shelling.Gleb Garanich/Reuters

A police vehicle patrols the streets of Kyiv on February 26.Pierre Crom/Getty Images

Following a national directive to help complicate the invading Russian Army’s attempts to navigate, a road worker removes signs near Pisarivka, Ukraine, on February 26.Brendan Hoffman/The New York Times/Redux

A man kneels in front of a Russian tank in Bakhmach, Ukraine, on February 26 as Ukrainian citizens attempted to stop the tank from moving forward. The dramatic scene was captured on video, and CNN confirmed its authenticity. The moment drew comparisons to the iconic “Tank Man” of Tiananmen Square.From Telegram

People in Kyiv board a train heading to the west of the country on February 26. Kelly Clements, the United Nations Deputy High Commissioner for Refugees, told CNN that more than 120,000 people had left Ukraine while 850,000 were internally displaced.Pierre Crom/Getty Images

Ukrainian service members look for and collect unexploded shells after fighting in Kyiv on February 26.Sergei Supinsky/AFP/Getty Images

Smoke and flames are seen near Kyiv on February 26. Explosions were seen and heard in parts of the capital as Ukrainians battled to hold back advancing Russian troops.Gleb Garanich/Reuters

The body of a Russian soldier lies next to a Russian vehicle outside Kharkiv on February 25.Tyler Hicks/The New York Times/Redux

Newly married couple Yaryna Arieva and Sviatoslav Fursin pose for photo in Kyiv on February 25 after they joined the Territorial Defense Forces.Mikhail Palinchak/AP

Members of the Ukrainian National Guard take positions in central Kyiv on February 25.Gleb Garanich/Reuters

People walk past a residential building in Kyiv that was hit in an alleged Russian airstrike on February 25.Timothy Fadek/Redux for CNN

The body of a school employee, who according to locals was killed in recent shelling, lies in the separatist-controlled town of Horlivka in Ukraine’s Donetsk region on February 25.Alexander Ermochenko/Reuters

Kyiv residents take shelter in an underground parking garage on February 25.Timothy Fadek/Redux for CNN

The body of a rocket remains in an apartment after shelling on the northern outskirts of Kharkiv on February 24.Sergey Bobok/AFP/Getty Images

A wounded woman stands outside a hospital after an attack on the eastern Ukrainian town of Chuhuiv, outside of Kharkiv, on February 24.Aris Messinis/AFP/Getty Images

A boy plays with his tablet in a public basement used as a bomb shelter in Kyiv on February 24.Emilio Morenatti/AP

Sviatoslav Fursin, left, and Yaryna Arieva kneel during their wedding ceremony at the St. Michael’s Cathedral in Kyiv on February 24. They had planned on getting married in May, but they rushed to tie the knot due to the attacks by Russian forces. “We maybe can die, and we just wanted to be together before all of that,” Arieva said.Christian Streib/CNN

Ukrainian service members sit atop armored vehicles driving in eastern Ukraine’s Donetsk region on February 24.Vadim Ghirda/AP

People in Kyiv try to board a bus to travel west toward Poland on February 24.Timothy Fadek/Redux for CNN

US President Joe Biden arrives in the East Room of the White House to address the Russian invasion on February 24. “Putin is the aggressor. Putin chose this war. And now he and his country will bear the consequences,” Biden said, laying out a set of measures that will “impose severe cost on the Russian economy, both immediately and over time.”Al Drago/Bloomberg/Getty Images

Smoke rises from a military airport in Chuhuiv on February 24. Airports were also hit in Boryspil, Kharkiv, Ozerne, Kulbakino, Kramatorsk and Chornobaivka.Aris Messinis/AFP/Getty Images

People seek shelter inside a subway station in Kharkiv on February 24.Marcus Yam/Los Angeles Times/Shutterstock

Russian military vehicles are seen at the Chernobyl power plant near Pripyat, Ukraine, on February 24. Russian forces have seized control of the the plant, the site of the world’s worst nuclear disaster, according to the agency that manages the area.From Telegram

People wait after boarding a bus to leave Kyiv on February 24.Timothy Fadek/Redux for CNN

Ukrainian President Zelensky holds an emergency meeting in Kyiv on February 24. In a video address, Zelensky announced that he was introducing martial law. He urged people to remain calm.Ukrainian Presidency/Anadolu Agency/Getty Images

Police officers inspect the remains of a missile that landed in Kyiv on February 24.Valentyn Ogirenko/Reuters

A staff member of a Kyiv hotel talks on the phone on February 24.Ethan Swope/Bloomberg/Getty Images

Smoke rises from an air defense base after an apparent Russian strike in Mariupol on February 24. A CNN team in Mariupol reported hearing a barrage of artillery.Evgeniy Maloletka/AP

People wait in line to buy train tickets at the central station in Kyiv on February 24.Timothy Fadek/Redux for CNN

A long line of cars is seen exiting Kyiv on February 24. Heavy traffic appeared to be heading west, away from where explosions were heard early in the morning.Valentyn Ogirenko/Reuters

A photo provided by the Ukrainian President’s office appears to show an explosion in Kyiv early on February 24.Ukrainian President’s Office

People in Moscow watch a televised address by Russian President Vladimir Putin as he announces a military operation in the Donbas region of eastern Ukraine on February 24. “Whoever tries to interfere with us, and even more so to create threats to our country, to our people, should know that Russia’s response will be immediate and will lead you to such consequences as you have never experienced in your history,” he said.Sergei Illnitsky/EPA-EFE/Shutterstock

An emergency meeting of the UN Security Council is held in New York to discuss the crisis on February 23. UN Secretary General Antonio Guterres told Russian President Vladimir Putin to stop “attacking Ukraine” and to give peace a chance.Timothy A. Clary/AFP/Getty Images

A convoy of Russian military vehicles is seen February 23 in the Rostov region of Russia, which runs along Ukraine’s eastern border.Anadolu Agency/Getty Images

Ukrainian soldiers talk in a shelter at the front line near Svitlodarsk, Ukraine, on February 23.Evgeniy Maloletka/AP

Smoke rises from a damaged power plant in Shchastya that Ukrainian authorities say was hit by shelling on February 22.Tyler Hicks/The New York Times/Redux

A damaged house is worked on after shelling near the Ukrainian front-line city of Novoluhanske on February 22.Gleb Garanich/Reuters

Mourners gather at a church in Kyiv on February 22 for the funeral of Ukrainian Army Capt. Anton Sydorov. The Ukrainian military said he was killed by a shrapnel wound on February 19 after several rounds of artillery fire were directed at Ukrainian positions near Myronivske.Timothy Fadek/Redux for CNN

A sign displays conversion rates at a currency exchange kiosk in Kyiv on February 22. Global markets tumbled the day after Putin ordered troops into parts of eastern Ukraine.Christopher Occhicone/Bloomberg/Getty Images

Russian howitzers are loaded onto train cars near Taganrog, Russia, on February 22.The New York Times/Redux

People who left a separatist-held region in eastern Ukraine watch an address by Putin from their hotel room in Taganrog, Russia, on February 21. Putin blasted Kyiv’s growing security ties with the West, and in lengthy remarks about the history of the USSR and the formation of the Ukrainian Socialist Soviet Republic, he appeared to cast doubt on Ukraine’s right to self-determination.Sergey Ponomarev/The New York Times/Redux

Putin signs decrees recognizing the Donetsk People’s Republic and the Luhansk People’s Republic in a ceremony in Moscow on February 21. Earlier in the day, the heads of the self-proclaimed pro-Russian republics requested the Kremlin leader recognize their independence and sovereignty. Members of Putin’s Security Council supported the initiative in a meeting earlier in the day.Alexei Nikolsky/Sputnik/Kremlin/Pool/AP

Protesters demanding economic sanctions against Russia stand outside the Ministry of Foreign Affairs in Kyiv on February 21. Only a small number of protesters showed up to demonstrate.Timothy Fadek/Redux for CNN

Activists hold a performance in front of the Russian embassy in Kyiv on February 21 in support of prisoners who were arrested in Crimea. They say the red doors are a symbol of the doors that were kicked in to search and arrest Crimean Tatars, a Muslim ethnic minority.Timothy Fadek/Redux for CNN

Ukrainian servicemen shop in the front-line town of Avdiivka, Ukraine, on February 21.Aleksey Filippov/AFP/Getty Images

People lay flowers at the Motherland Monument in Kyiv on February 21.Ali Atmaca/Anadolu Agency/Getty Images

A couple arrives at the city council to get married in Odesa on February 20. As Ukrainian authorities reported further ceasefire violations and top Western officials warned about an impending conflict, life went on in other parts of the country.Emilio Morenatti/AP

Ukrainian Interior Minister Denys Monastyrskiy, left, visits soldiers at a front-line position in Novoluhanske on February 19. Minutes after he left, the position came under fire. No one was injured.Timothy Fadek/Redux for CNN

A woman rests in a car near a border checkpoint in Avilo-Uspenka, Russia, on February 19.Andrey Borodulin/AFP/Getty Images

A Ukrainian service member walks by a building on February 19 that was hit by mortar fire in the front-line village of Krymske, Ukraine.Vadim Ghirda/AP

Fighter jets fly over Belarus during a joint military exercise the country held with Russia on February 19.Peter Kovalev/TASS/Getty Images

Ukrainian soldiers stand guard at a military command center in Novoluhanske on February 19.Timothy Fadek/Redux for CNN

People sit on a bus in Donetsk on February 18 after they were ordered to evacuate to Russia by pro-Russian separatists.Alexander Ermochenko/Reuters

The remains of a military vehicle are seen in a parking lot outside a government building following an explosion in Donetsk on February 18. Ukrainian and US officials said the vehicle explosion was a staged attack designed to stoke tensions in eastern Ukraine.Nikolai Trishin/TASS/Getty Images

A memorial service and candlelight vigil is held at the St. Michael’s Golden-Domed Monastery in Kyiv on February 18. They honored those who died in 2014 while protesting against the government of President Viktor Yanukovych, a pro-Russian leader who later fled the country.Timothy Fadek/Redux for CNN

A kindergarten that officials say was damaged by shelling is seen in Stanytsia Luhanska, Ukraine, on February 17. No lives were lost, but it was a stark reminder of the stakes for people living near the front lines that separate Ukrainian government forces from Russian-backed separatists.Carlos Barria/Reuters

Children play on old Soviet tanks in front of the Motherland Monument in Kyiv on February 16.Timothy Fadek/Redux for CNN

Ambassadors of European countries lay roses at the Wall of Remembrance in Kyiv on February 16. The wall contains the names and photographs of military members who have died since the conflict with Russian-backed separatists began in 2014.Timothy Fadek/Redux for CNN

US troops walk on the tarmac at the Rzeszów-Jasionka Airport in southeastern Poland on February 16. US paratroopers landed in Poland as part of a deployment of several thousand sent to bolster NATO’s eastern flank in response to tensions with Russia.Wojtek Radawanski/AFP/Getty Images

A 200-meter-long Ukrainian flag is unfolded at the Olympic Stadium in Kyiv on February 16 to mark a “Day of Unity,” an impromptu celebration declared by President Volodymyr Zelensky.Timothy Fadek/Redux for CNN

Travelers wait in line to check in to their departing flights February 15 at the Boryspil International Airport outside Kyiv. US President Joe Biden urged Americans in Ukraine to leave the country, warning that “things could go crazy quickly” in the region.Timothy Fadek/Redux for CNN

A location of Oschadbank, a state-owned bank, is seen in Kyiv on February 15. The websites of Oschadbank and PrivatBank, the country’s two largest banks, were hit by cyberattacks that day, as were the websites of Ukraine’s defense ministry and army, according to Ukrainian government agencies.Brendan Hoffman/The New York Times/Redux

A woman and child walk underneath a military monument in Senkivka, Ukraine, on February 14. It’s on the outskirts of the Three Sisters border crossing between Ukraine, Russia and Belarus.Chris McGrath/Getty Images

Ukrainian service members talk at a front-line position in eastern Ukraine on February 14. Vadim Ghirda/AP

Members of Ukraine’s National Guard look out a window as they ride a bus through the capital of Kyiv on February 14.Emilio Morenatti/AP

Satellite images taken on February 13 by Maxar Technologies revealed that dozens of helicopters had appeared at a previously vacant airbase in Russian-occupied Crimea.Satellite image ©2022 Maxar Technologies

Pro-Russian separatists observe the movement of Ukrainian troops from trenches in Ukraine’s Donbas area on February 11.Svetlana Kisileva/Abaca/Sip/AP

Ukrainian service members unpack Javelin anti-tank missiles that were delivered to Kyiv on February 10 as part of a US military support package for Ukraine.Valentyn Ogirenko/Reuters

Ukrainian service members walk on an armored fighting vehicle during a training exercise in eastern Ukraine’s Donetsk region on February 10.Vadim Ghirda/AP

You May Also Like