A woman walks along a street damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A woman pulls a wheel chair while transporting an injured man in a street in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A view shows a lamp pole in the shape of a pigeon located in Freedom Square near a block of flats heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Local resident gather in a courtyard near a block of flats heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Local resident Raisa Budarina, 84, reacts while speaking outside a block of flats heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

People are seen in a courtyard near a block of flats heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A service member of pro-Russian troops stands guard in a street while checking civilians' documents in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A man rides a bicycle past a residential building, which was heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

People walk past a residential building, which was heavily damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

An aerial view shows a residential building destroyed during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. Picture taken with a drone. REUTERS/Pavel Klimov 

People ride bicycles near a car destroyed during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Local residents gather in a courtyard damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A local resident sits on a bench in a courtyard damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Tanks of Ukrainian Armed Forces ride along a street in a village, as Russia's attack on Ukraine continues, in Donetsk Region, Ukraine April 18, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman digs a trench at a position, as Russia's attack on Ukraine continues, in Donetsk Region, Ukraine April 18, 2022. REUTERS/Serhii Nuzhnenko 

Local Volodymir, 45, watches a fire burning at his garage, following Russian shelling, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 18, 2022. REUTERS/Alkis Konstantinidis 

A firefighter tries to extinguish a fire burning at a garage, following Russian shelling, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 18, 2022. REUTERS/Alkis Konstantinidis 

Service members of pro-Russian troops stand guard in a street while checking civilians' documents in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A local resident stands in a courtyard near trees broken during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

A man repairs his windows, which were damaged by shelling, amid Russia's invasion, in Kramatorsk, Donetsk region, Ukraine, April 18, 2022. REUTERS/Marko Djurica 

People look at the crater made by a Kalibr missile, amid Russia's invasion, in Kramatorsk, Donetsk region, Ukraine, April 18, 2022. REUTERS/Marko Djurica 

Cars destroyed amid Russia's attack on Ukraine are seen, after they were collected from different places, in Irpin, Kyiv region, Ukraine April 18, 2022. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY 

Smoke rises above a plant of Azovstal Iron and Steel Works company and buildings damaged in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

People walk near buildings damaged in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Smoke rises above a plant of Azovstal Iron and Steel Works company and buildings damaged in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 18, 2022. REUTERS/Alexander Ermochenko 

Firefighters work at the site of military strikes on buildings as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Pavlo Palamarchuk 

Firefighters work at the site of military strikes on buildings as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Pavlo Palamarchuk 

A view of at least three rows of new graves for people killed during Russia's invasion of Ukraine, at a cemetery in Irpin, Kyiv region, Ukraine April 18, 2022. Picture taken with a drone. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY 

A Ukrainian serviceman walks near the site of military strikes on buildings as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Roman Baluk 

Smoke rises after military strikes, as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Roman Baluk 

Smoke rises after missile strikes, as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Vladyslav Sodel 

Smoke rises after missile strikes, as Russia's attack on Ukraine continues, in Lviv, Ukraine April 18, 2022. REUTERS/Vladyslav Sodel 

Service members of pro-Russian troops gather in a street during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

A view shows a street, which was damaged during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

Tanks of pro-Russian troops drive along a road during Ukraine-Russia conflict near the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

Tanks of pro-Russian troops drive along a road during Ukraine-Russia conflict near the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

Tanks of pro-Russian troops drive along a road during Ukraine-Russia conflict near the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

People walk past the turret of a tank, which was destroyed during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

A service member of pro-Russian troops walks past a residential building burnt out during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

A passenger of a car speaks near the turret of a tank, which was destroyed during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

A tank and trucks of pro-Russian troops drive along a road during Ukraine-Russia conflict near the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops sit atop of an armoured vehicle during Ukraine-Russia conflict near the southern port city of Mariupol, Ukraine April 17, 2022. REUTERS/Alexander Ermochenko 

A Ukrainian woman Zhanna Lishchynska cries after talking on mobile phone with her husband who is on the front lines of the war, amid Russia's invasion of Ukraine, in Zaporizhzhya, Ukraine April 17, 2022. REUTERS/Ueslei Marcelino