Local residents walk near residential buildings which were damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 18, 2022. REUTERS/Stringer TPX IMAGES OF THE DAY 

Local residents take cover as they hear blasts during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

A view shows service members of pro-Russian troops and tanks during Ukraine-Russia conflict on the outskirts of the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

People dig a grave for victims killed during Ukraine-Russia conflict in a street in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Local residents stay at a bomb shelter during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops check cars during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Local resident Lyudmila, 82, who didn't give her full name, stays at a bomb shelter during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops are seen in the body of a truck during Ukraine-Russia conflict on a road near the besieged southern port city of Mariupol, Ukraine March 21, 2022. REUTERS/Alexander Ermochenko 

Local residents carry bottles with water during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops are seen atop of tanks during Ukraine-Russia conflict on the outskirts of the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops are seen atop of tanks during Ukraine-Russia conflict on the outskirts of the besieged southern port city of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Refugees gather in a street as they leave the city during Ukraine-Russia conflict in the besieged southern port of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Refugees rest in a street as they leave the city during Ukraine-Russia conflict in the besieged southern port of Mariupol, Ukraine March 20, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops in uniforms without insignia drive an armoured vehicle during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 19, 2022. REUTERS/Stringer 

People gather near a blocks of flats, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Men pool carts while walking past a line of cars with evacuees, who leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Evacuees fleeing Ukraine-Russia conflict sit in the body of a cargo vehicle while waiting in a line to leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Evacuees fleeing Ukraine-Russia conflict sit in a damaged car as they wait in a line to leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Local residents, who seek refuge in the basement of a building during Ukraine-Russia conflict, are seen in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People walk near a building, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

A service member of pro-Russian troops walks near a line of cars with evacuees, who leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

A local resident, who seeks refuge in the basement of a building during Ukraine-Russia conflict, is seen in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People pull a cart with belongings near a wholesale and retail warehouse, which was damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Local residents, who seek refuge in the basement of a building during Ukraine-Russia conflict, are seen in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

A woman reacts while speaking near a block of flats, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Evacuees fleeing Ukraine-Russia conflict sit in a car as they wait in a line to leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People walk near a block of flats, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People walk near blocks of flats, which were destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Local residents walk past a block of flats, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People use carts to transport belongings near a building, which was destroyed during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People push carts near blocks of flats, which were damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Service members of pro-Russian troops check cars, as local residents leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

People walk near blocks of flats, which were damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Evacuees fleeing Ukraine-Russia conflict walk out of the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Evacuees fleeing Ukraine-Russia conflict sit in the body of a cargo vehicle while waiting in a line to leave the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

Evacuees fleeing Ukraine-Russia conflict walk out of the besieged southern port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko 

A view shows a line of cars near blocks of flats destroyed during Ukraine-Russia conflict, as evacuees leave the besieged port city of Mariupol, Ukraine March 17, 2022. REUTERS/Alexander Ermochenko