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 

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 

A woman walks next to an armoured vehicle of pro-Russian troops the building of a theatre destroyed in the course of Ukraine-Russia conflict in the southern port city of Mariupol, Ukraine April 10, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

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 

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 

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 

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 

Residents queue to get water during 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 

A resident walks 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 queue to get water during 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 

A view shows the building of a theatre destroyed in the course of Ukraine-Russia conflict, as a word "children" in Russian is written in large white letters on the pavement, in the southern port city of Mariupol, Ukraine April 10, 2022. Picture taken with a drone. REUTERS/Pavel Klimov 

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 

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 

Residents walk along a street 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 

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