A firefighter works at a site of a fire, as Russia's invasion of Ukraine continues, in Kharkiv, Ukraine March 16, 2022. REUTERS/Oleksandr Lapshyn 

Rescuers work next to a building damaged by air strike, as Russia's attack on Ukraine continues, in central Kharkiv, Ukraine March 14, 2022. REUTERS/Vitalii Hnidyi 

A woman cleans debris from her apartment inside a residential building after it was hit by shelling as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 15, 2022. REUTERS/Marko Djurica 

A man helps to remove a car that was damaged when a shell hit a residential building, as Russia's attack on Ukraine continues, in the Obolon district in Kyiv, Ukraine, March 14, 2022. REUTERS/Thomas Peter 

A woman walks with a bicycle next to a building damaged during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 15, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Firefighters work to put out a fire in a residential apartment building after it was hit by shelling as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 15, 2022. REUTERS/Marko Djurica TPX IMAGES OF THE DAY 

Firefighters work at a site of a warehouse fire, as Russia's invasion of Ukraine continues, in Kharkiv, Ukraine March 16, 2022. REUTERS/Oleksandr Lapshyn 

A hole in the roof of a tram is seen at a depot, amid Russia's invasion of Ukraine, in Kharkiv, Ukraine March 14, 2022. REUTERS/Oleksandr Lapshyn TPX IMAGES OF THE DAY 

Rescuers work next to a building damaged by air strike, as Russia's attack on Ukraine continues, in central Kharkiv, Ukraine March 14, 2022. REUTERS/Vitalii Hnidyi 

A woman stands outside a local hospital, which was destroyed during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 12, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

Rescuers work at a site of a warehouse storing products burned after shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine March 16, 2022. REUTERS/Vitalii Hnidyi 

A local resident rides a scooter past a building damaged during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 15, 2022. REUTERS/Alexander Ermochenko 

The debris of damaged houses lies on the ground near the spot where a cultural center and administration building once stood, destroyed during an aerial bombing as Russia's advance on the Ukrainian capital continues, in the village of Byshiv outside Kyiv, Ukraine, March 12, 2022. REUTERS/Thomas Peter 

Local residents walk past a building destroyed during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 15, 2022. REUTERS/Alexander Ermochenko 

A man stands next to a Foxtrot store that was destroyed by shelling, as Russia's invasion of Ukraine continues, in Kharkiv, Ukraine March 15, 2022. REUTERS/Oleksandr Lapshyn 

A police officer guards an area around a building destroyed by shelling as Russia's attack on Ukraine continues, in Kyiv, Ukraine March 14, 2022. REUTERS/Gleb Garanich 

Damaged cars and buildings are seen, amid Russia's invasion of Ukraine, in Kharkiv, Ukraine March 14, 2022. REUTERS/Oleksandr Lapshyn 

A view shows residential buildings damaged by an airstrike, as Russia?s attack on Ukraine continues, in Kharkiv, Ukraine March 15, 2022. REUTERS/Vitalii Hnidyi 

A man removes debris outside a residential building damaged by shelling during Ukraine-Russia conflict in the separatist-controlled town of Makeyevka (Makiivka) outside Donetsk, Ukraine March 16, 2022. REUTERS/Alexander Ermochenko 

Rescuers work at a site of a warehouse storing products burned after shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine March 16, 2022. REUTERS/Vitalii Hnidyi 

People remove debris near a building damaged by shelling during Ukraine-Russia conflict in the separatist-controlled town of Makeyevka (Makiivka) outside Donetsk, Ukraine March 16, 2022. REUTERS/Alexander Ermochenko 

A resident walks through debris next to a building that was hit by shelling, as Russia's attack on Ukraine continues, in Kyiv, Ukraine March 16, 2022. REUTERS/Thomas Peter 

A local resident is seen next to a destroyed armoured vehicle during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 15, 2022. REUTERS/Alexander Ermochenko 

Rescuers work next to an apartment building that was hit by shelling, as Russia's attack on Ukraine continues, in Kyiv, Ukraine March 16, 2022. REUTERS/Thomas Peter 

A local resident rides a bicycle past a building destroyed during Ukraine-Russia conflict in the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine March 15, 2022. REUTERS/Alexander Ermochenko 

A firefighter enters a residential building that was hit by a shell as Russia's attack on Ukraine continues, in the Obolon district in Kyiv, Ukraine, March 14, 2022. REUTERS/Thomas Peter 

People help a man during the evacuation of civilians as Russia's invasion of Ukraine continues, in the town of Irpin outside Kyiv, Ukraine, March 13, 2022. REUTERS/Marko Djurica 

A man walks through the debris of a cultural center and an administration building that were destroyed during aerial bombing, as Russia's advance on the Ukrainian capital continues, in the village of Byshiv outside Kyiv, Ukraine, March 12, 2022. REUTERS/Thomas Peter