Russia's invasion of Ukraine enters 100th day

Ukrainian tanks move into the city, after Russian President Vladimir Putin authorized a military operation in eastern Ukraine, in Mariupol, February 24, 2022. February 24: Russia invades Ukraine from three fronts in the biggest assault on a European state since World War Two. Tens of thousands flee.

Ukrainian President Volodymyr Zelenskiy poses after an interview with Reuters in Kyiv, Ukraine, March 1, 2022. February 24: Russian President Vladimir Putin announces a "special military operation" to demilitarise and "denazify" Ukraine. Ukrainian President Volodymyr Zelenskiy tweets: "Russia has embarked on a path of evil, but Ukraine is defending itself."

An aerial view shows a residential building destroyed by shelling, as Russia's invasion of Ukraine continues, in the settlement of Borodyanka in the Kyiv region, Ukraine March 3, 2022. February 25: Ukrainian forces battle Russian invaders in the north, east and south. Artillery pounds Kyiv and its suburbs.

A view shows destroyed military vehicles on a street, as Russia's invasion of Ukraine continues, in the town of Bucha in the Kyiv region, Ukraine March 1, 2022. March 1: A U.S. official says a miles-long Russian armoured column bearing down on Kyiv is beset by logistical problems.

A blast is seen at the TV tower in Kyiv, Ukraine March 1, 2022. March 1: Russia hits a TV tower in Kyiv and intensifies its long-range bombardment of Kharkiv in the northeast and other cities, in what is seen as a shift in Moscow's tactics as its hopes of a quick charge on the capital fade.

Fires burn in a residential area after shelling in Mariupol, Ukraine March 3, 2022. March 2: Russian forces start a siege of the southeastern port of Mariupol, seen as vital to Moscow's attempts to link the eastern Donbas region with Crimea, the Black Sea peninsula Russia seized in 2014.

A couple take shelter at an underground metro station as Russia's invasion of Ukraine continues, in Kyiv, Ukraine March 2, 2022. March 2: Russian troops enter the Black Sea port of Kherson, the first large urban centre captured.

Cars line up on the road to the Shehyni border crossing as people flee to Poland, after Russia launched a massive military operation against Ukraine, outside Mostyska, Ukraine, February 27, 2022. March 2: One million people have fled Ukraine, the U.N. refugee agency (UNHCR) says.

Members of the Ukrainian Volunteer Corps fire with a howitzer, as Russia's attack on Ukraine continues, at a position in Zaporizhzhia region, Ukraine March 28, 2022. March 4: Russian forces seize Zaporizhzhia nuclear power plant, Europe's biggest. NATO rejects Ukraine's appeal for no-fly zones, saying they would escalate the conflict.

Refugees evacuated on a train from Kyiv, following the Russian invasion of Ukraine, wait for transfer to Poland outside the train station in Lviv, Ukraine, March 7, 2022. March 8: Civilians flee the northeastern city of Sumy in the first successful humanitarian corridor agreed. Two million have now fled Ukraine, the UNHCR says.

A person is carried out after the destruction of Mariupol children's hospital in Mariupol, Ukraine, March 9, 2022. March 9: Ukraine accuses Russia of bombing a maternity hospital in Mariupol, burying people in the rubble. Russia says Ukrainian fighters were occupying the building.

An injured serviceman looks out of an ambulance following an attack on the Yavoriv military base, amid Russia’s invasion of Ukraine, outside a hospital in Yavoriv, Ukraine, March 13, 2022. March 13: Russia extends its war deep into western Ukraine, firing missiles at a base near the border with NATO member Poland.

A theatre which was damaged in the course of the conflict stands in the southern port city of Mariupol, Ukraine April 3, 2022. March 16: Ukraine accuses Russia of bombing a Mariupol theatre where hundreds of civilians are sheltering. Moscow denies it.

A man walks past a fire after a shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine March 25, 2022. March 25: Moscow signals a shift in focus to making gains in the east, while Ukrainian forces press to recapture towns outside Kyiv.

A refugee waits in a car as an armoured personnel carrier of pro-Russian troops drives past a checkpoint in the besieged port city of Mariupol, Ukraine March 24, 2022. March 30: More than 4 million people have fled Ukraine, the UNHCR says.

A body with hands bound by white cloth, who according to residents was shot by Russian soldiers, lies on the street in Bucha, Ukraine April 3, 2022. April 3/4: Ukraine accuses Russia of war crimes after a mass grave and bodies of people shot at close range are found in the recaptured town of Bucha. The Kremlin denies responsibility and says images of bodies were staged.

Abandoned belongings lie on the ground at the site of a missile strike at a rail station in Kramatorsk, Ukraine April 8, 2022. April 8: Ukraine blames Russia for a missile attack on a train station in Kramatorsk that killed at least 52 people trying to flee the looming eastern offensive. Moscow denies responsibility.

Veteran of the Black Sea Fleet Sergei Gorbachev and an Orthodox priest take part in a ceremony organised by the veterans in memory of the Russian missile cruiser Moskva, which sank in the Black Sea following a fire, in Sevastopol, Crimea April 15, 2022. April 14: Russia's lead warship in the Black Sea, the Moskva, sinks after what Ukraine says was a missile strike. Russia blames an ammunition explosion.

Ukrainian servicemen rest at a position, as Russia's attack on Ukraine continues, in Donetsk Region, Ukraine April 18, 2022. April 18: Russia launches what Ukraine describes as the Battle of Donbas, a campaign to seize two provinces and salvage a battlefield victory.

Service members of pro-Russian troops, including fighters of the Chechen special forces unit, stand in front of the destroyed administration building of Azovstal Iron and Steel Works in the port city of Mariupol, Ukraine April 21, 2022. April 21:  Putin declares Mariupol "liberated" after nearly two months of siege, but hundreds of defenders hold out inside the city's huge Azovstal steelworks.

UN Secretary-General Antonio Guterres visits the town of Borodianka, as Russia's attack on Ukraine continues, outside of Kyiv, Ukraine April 28, 2022. April 28: Russia fires two missiles into Kyiv during a visit by U.N. Secretary-General Antonio Guterres, Ukraine says. The Kremlin accuses Ukraine of attacking Russian regions near the border.

People walk their bikes across the street as smoke rises above a plant of Azovstal Iron and Steel Works during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine May 2, 2022. May 1: About 100 Ukrainian civilians are evacuated from Mariupol's ruined Azovstal steelworks, in what the United Nations says is a "safe passage operation".

Russian President Vladimir Putin holds a portrait of his father, war veteran Vladimir Spiridonovich Putin, as he takes part in the Immortal Regiment march on Victory Day, which marks the 77th anniversary of the victory over Nazi Germany in World War Two, in central Moscow, Russia May 9, 2022. May 9: Putin exhorts Russians to battle in a defiant Victory Day speech, but is silent about plans for any escalation in Ukraine.

A Ukrainian serviceman fires a mortar at an unknown location in Kharkiv region, Ukraine May 9, 2022. May 10: Ukraine says its forces have recaptured villages north and northeast of Kharkiv in a counter-offensive.

Ukrainian refugees from the Azovstal steel plant in Mariupol are seen in a bus as they arrive at a registration and humanitarian aid centre for internally displaced people, amid Russia's ongoing invasion of Ukraine, in Zaporizhzhia, Ukraine May 8, 2022. May 12: More than 6 million people have fled Ukraine, the UNHCR says.

A volunteer stands next to the bodies of Russian soldiers found in the village of Vilkhivka after it was retaken by Ukrainian forces, in Kharkiv region, Ukraine May 9, 2022. May 14: Ukrainian forces have launched a counteroffensive near the eastern Russian-held town of Izium, the local governor says.

U.S. President Joe Biden poses for a photo as he welcomes Sweden's Prime Minister Magdalena Andersson and Finland's President Sauli Niinisto at the White House in Washington, U.S., May 19, 2022. May 18: Finland and Sweden apply to join NATO, a move that would lead to the expansion of the Western military alliance that Putin aimed to prevent.

A bus carrying wounded service members of Ukrainian forces from the besieged Azovstal steel mill in Mariupol drives under escort of the pro-Russian military upon arrival in Novoazovsk, Ukraine May 16, 2022. May 20: Russia says the last of Ukrainian fighters holding out at Mariupol's Azovstal steelworks have surrendered. Hours earlier, Zelenskiy said Ukraine's military had told the defenders they could get out and save their lives.

A service member of the Ukrainian armed forces holds a piece of artillery at an artillery position near Donetsk, in the Donetsk region, Ukraine, May 22, 2022. May 21/22: Russia launches an offensive in Luhansk, one of two provinces in Donbas, focusing the attack on twin cities of Sloviansk and Sievierodonetsk.

Russian soldier Vadim Shishimarin, 21, suspected of violations of the laws and norms of war, stands during a court hearing in Kyiv, Ukraine May 23, 2022. May 23: In the first war crimes trial of the conflict, a Kyiv court sentences a young Russian tank commander to life in prison for killing an unarmed civilian.

Service members of pro-Russian troops are seen at a former fighting position of the Ukrainian armed forces outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. May 25: Putin signs a decree simplifying the process for residents of newly captured districts to acquire Russian citizenship and passports in a bid to solidify Moscow's grip on the seized territory.

A wounded Ukrainian serviceman army is carried in a military vehicle during an evacuation in Sievierodonetsk, Luhansk region Ukraine June 2, 2022. May 29: Russia's Foreign Minister Sergei Lavrov calls the "liberation" of Donbas an "unconditional priority" for Moscow, while Russian forces appear close to seizing the entire Luhansk region there after days of slow but steady gains.

A self-propelled howitzer 2S1 Gvozdika of pro-Russian troops fires a leaflet shell in the direction of Sievierodonetsk to disperse information materials from their combat positions in the Luhansk region, Ukraine May 24, 2022. May 31: Local officials say it is no longer possible to evacuate civilians trapped in Sievierodonetsk, where Ukrainian forces are still holding out but part of the city is under Russian control.

A family reunification takes place after evacuating from Russian troop-occupied Kupiansk town in a bus convoy on the outskirts of Kharkiv, Ukraine May 30, 2022. June 1: Russia criticizes U.S. decision to supply advanced rocket systems to Ukraine, warning it could widen the conflict and increase the risk of direct confrontation with Washington.

A local resident walks, as his neighbour's house burns after shelling, as Russia's attack on Ukraine continues, in Lysychansk, Luhansk region Ukraine June 2, 2022. June 2: Zelenskiy pleads for more Western arms to help Ukraine reach an "inflection point" and prevail in the war. The European Union gives final approval to new sanctions on Russian oil and top bank Sberbank.

The casket containing the body of 32-year-old Oleksii Koteler, who died during Russian shelling, is seen in the backyard of his house, during an exhumation as part of a prosecutor's investigation into war crime cases in Koropy village on the outskirts of Kharkiv, Ukraine May 27, 2022. June 3: Ukraine does not plan to use multiple-launch rocket systems it receives from the United States to attack facilities in Russia, a Ukrainian presidential adviser says. Britain's defense ministry said that on the 100th day of Russia's invasion Moscow has failed to achieve its initial objectives to seize Kyiv and centers of government but is achieving tactical success in the Donbas.