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. REUTERS/Alexander Ermochenko

Ammunition holes are seen at a local church gate, as Russia's attack on Ukraine continues, in Mala Rohan, Ukraine, May 25, 2022. REUTERS/Ivan Alvarado

SENSITIVE MATERIAL. THIS IMAGE MAY OFFEND OR DISTURB Olena and Oleksandr, relatives of Ukrainian serviceman Eduard Trepylchenko who got killed in the Kharkiv region during a fight with Russian troops, react during his funeral, amid Russia's invasion of Ukraine, in Kyiv, Ukraine May 25, 2022. REUTERS/Viacheslav Ratynskyi TPX IMAGES OF THE DAY

A Ukrainian service member rides on top of a tank, amid Russia's invasion of Ukraine, near the town of Pokrovsk, Donetsk region, Ukraine, May 25, 2022. REUTERS/Carlos Barria

Service members of pro-Russian troops are seen at a former fighting position of the Ukrainian armed forces during Ukraine-Russia conflict outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. REUTERS/Alexander Ermochenko

Vladimir Krayushkin lights a cigarette next to a destroyed Russian tank placed on his yard, as Russia's attack on Ukraine continues, in Mala Rohan, Ukraine May 25, 2022. REUTERS/Ivan Alvarado

SENSITIVE MATERIAL. THIS IMAGE MAY OFFEND OR DISTURB An almost buried body is seen next to local cemetery, as Russia's attack on Ukraine continues, in Vilkhivka, Ukraine, May 25, 2022. REUTERS/Ivan Alvarado

Service members of pro-Russian troops inspect an AT4 anti-tank launcher of the Ukrainian armed forces during Ukraine-Russia conflict outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. REUTERS/Alexander Ermochenko

Service members of pro-Russian troops carry leaflet shells at their combat positions in the Luhansk region, Ukraine May 24, 2022. REUTERS/Alexander Ermochenko

An insect is seen inside a Russian destroyed tank's cannon, as Russia's attack on Ukraine continues, in Mala Rohan, Ukraine, May 25, 2022. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

Smoke rises above a self-propelled howitzer 2S1 Gvozdika of pro-Russian troops, which fired a leaflet shell in the direction of Sievierodonetsk to disperse information materials from combat positions in the Luhansk region, Ukraine May 24, 2022. REUTERS/Alexander Ermochenko

Ukrainian and Russian ammunition containers are seen inside of the destroyed Vilkhivka school's gym, as Russia's attack on Ukraine continues, in Vilkhivka, Ukraine May 25, 2022. REUTERS/Ivan Alvarado

A man walks past an abandoned building damaged in a missile strike, amid Russia's invasion of the country, in the city of Kramatorsk, Donetsk region, Ukraine, May 26, 2022. REUTERS/Carlos Barria

Service members of pro-Russian troops inspect an AT4 anti-tank launcher of the Ukrainian armed forces during Ukraine-Russia conflict outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. REUTERS/Alexander Ermochenko

A man smiles as he sits in front of a destroyed house, as Russia's attack on Ukraine continues, in Vilkhivka, Ukraine, May 25, 2022. REUTERS/Ivan Alvarado

Ukrainian service members sit on top of a tank as they drive along a road, amid Russia's invasion of Ukraine, near the town of Pokrovsk, Donetsk region, Ukraine, May 25, 2022. REUTERS/Carlos Barria

Service members of pro-Russian troops remove branches covering a self-propelled howitzer 2S1 Gvozdika at their combat positions in the Luhansk region, Ukraine May 24, 2022. REUTERS/Alexander Ermochenko

A man stands next to a destroyed vehicle, as Russia's attack on Ukraine continues, in Vilkhivka, Ukraine, May 25, 2022. REUTERS/Ivan Alvarado

A damaged Ukrainian tank is transported out of the frontline, amid Russia's invasion of Ukraine near the city of Kramatorsk, Donetsk region, Ukraine, May 24, 2022. REUTERS/Carlos Barria

Service members of pro-Russian troops are seen at a former fighting position of the Ukrainian armed forces during Ukraine-Russia conflict outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. REUTERS/Alexander Ermochenko

Service members of pro-Russian troops are seen at a former fighting position of the Ukrainian armed forces during Ukraine-Russia conflict outside the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. Picture taken with a drone. REUTERS/Pavel Klimov

Territorial Defence Force member Dimitry, who turns 22 the day after, kisses his girlfriend Valentine, 17, as he prepares to board a train for the front line, amid Russia's invasion of Ukraine, in Kyiv, Ukraine, May 25, 2022. REUTERS/Edgar Su

An abandoned building damaged in a missile strike is seen, amid Russia's invasion of the country, in the city of Kramatorsk, Donetsk region, Ukraine, May 26, 2022. Picture taken with a drone. REUTERS/Carlos Barria

Local residents walk past service members of pro-Russian troops standing guard at the main square during Ukraine-Russia conflict in the town of Svitlodarsk in the Donetsk region, Ukraine May 25, 2022. REUTERS/Alexander Ermochenko

Service members of pro-Russian troops carry leaflet shells at their combat positions in the Luhansk region, Ukraine May 24, 2022. REUTERS/Alexander Ermochenko

General view of an abandoned building damaged in a missile strike, amid Russia's invasion of the country, in the city of Kramatorsk, Donetsk region, Ukraine, May 26, 2022. Picture taken with a drone. REUTERS/Carlos Barria

Ukrainian service member gestures on top of a tank driving along a road, amid Russia's invasion of Ukraine, near the town of Pokrovsk, Donetsk region, Ukraine, May 25, 2022. REUTERS/Carlos Barria