An armoured vehicle of pro-Russian troops is seen in the street during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 11, 2022. REUTERS/Chingis Kondarov 

Women walk past a bridge that according to residents was destroyed by Russian army soldiers while they were pulling out of the town of Ivankiv, Kyiv region, Ukraine April 12, 2022. REUTERS/Zohra Bensemra 

Service members of pro-Russian troops drive an armoured vehicle during Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 11, 2022. REUTERS/Chingis Kondarov 

A man looks out of his window that was broken during Russian shelling, amid Russia's invasion of Ukraine, in Borodianka, Kyiv region, Ukraine April 11, 2022. REUTERS/Zohra Bensemra 

Mourners attend the funeral ceremony of Ukrainian serviceman Roman Tiaka, 47, who was killed during Russia's invasion of the Ukraine, in Stebnyk, Lviv region, Ukraine, April 12, 2022. REUTERS/Viacheslav Ratynskyi TPX IMAGES OF THE DAY 

Mourners gather around the coffin of Ukrainian serviceman Roman Tiaka, 47, who was killed during Russia's invasion of the Ukraine, during his funeral ceremony in Stebnyk, Lviv region, Ukraine, April 12, 2022. REUTERS/Viacheslav Ratynskyi 

A man walks past the Kharkiv Regional Institute of the National Academy of Public Administration building which was destroyed during Russian shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine April 12, 2022. REUTERS/Alkis Konstantinidis 

A woman fleeing Russia's invasion of Ukraine looks out a window of her temporary housing in Odesa, Ukraine, April 11, 2022. REUTERS/Igor Tkachenko 

Residents carry their belongings near buildings destroyed in the course of Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

Graves of civilians killed during Ukraine-Russia conflict are seen next to apartment buildings in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Zinaida Makishaiva, 82, reacts as she recounts how Russian soldiers treated her, amid Russia's Invasion of Ukraine, in Borodyanka, Kyiv region, Ukraine April 11, 2022. Zinaida said "They came to my house and said go to the basement, "bitch". She put a sign on her house reading "there are people here" Soldiers started to shoot around her to scare her. "God saved my life". REUTERS/Zohra Bensemra 

A couple hugs while walking past a building that was heavily damaged by shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, April 10, 2022. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY 

Service members of pro-Russian troops drive armoured vehicles during Ukraine-Russia conflict on a road outside the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

People fleeing Russia's invasion of Ukraine sit in a train to Lviv at a railway station in Sloviansk, Ukraine, April 11, 2022. REUTERS/Marko Djurica TPX IMAGES OF THE DAY 

A rescuer walks during a search operation for bodies under the rubble of a building destroyed by Russian shelling, amid Russia's Invasion of Ukraine, in Borodyanka, Kyiv region, Ukraine April 11, 2022. REUTERS/Zohra Bensemra 

People fleeing Russia's invasion of Ukraine sit in a train to Lviv at a railway station in Sloviansk, Ukraine, April 11, 2022. REUTERS/Marko Djurica 

Residents carry their belongings near a building destroyed in the course of the Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

Residents walk near a building destroyed in the course of the Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

Military sappers destroys unexploded shells found after Russia's invasion near the village of Motyzhyn, in Kyiv region, Ukraine April 10, 2022. REUTERS/Mykola Tymchenko 

A view shows the building of a theatre destroyed in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 10, 2022. Picture taken with a drone. REUTERS/Pavel Klimov 

A mother reacts as she waits for police members to exhume from a well the body of her son, who according to the head of the village was killed by Russian soldiers amid Russia's invasion of Ukraine, at a fuel station in Buzova, Kyiv region, Ukraine April 10, 2022. REUTERS/Zohra Bensemra 

A monument to Ukrainian poet Taras Shevchenko is seen piled up with sandbags to protect it against damage from shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, April 10, 2022. REUTERS/Alkis Konstantinidis 

A local looks at a building that was heavily damaged by shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, April 10, 2022. REUTERS/Alkis Konstantinidis 

Ukrainian servicemen help an elderly woman to board a train as she flees Russia's invasion of Ukraine at a railway station in Sloviansk, Ukraine, April 11, 2022. REUTERS/Marko Djurica 

Residents stand with their belongings on a street near a building burnt in the course of Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

Graves of civilians killed during Ukraine-Russia conflict are seen next to apartment buildings in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

A resident stands with her belongings on a street near a building burnt in the course of the Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko 

Emergency workers remove debris of a building destroyed in the course of the Ukraine-Russia conflict, in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko