A local resident stands inside an apartment which was damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 18, 2022. REUTERS/Alexander Ermochenko TPX IMAGES OF THE DAY 

A paramedic helps a woman injured at the site of a residential district of Kyiv after it was hit by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Vladyslav Musiienko TPX IMAGES OF THE DAY 

A man walks near destroyed cars in a residential district that was damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Marko Djurica TPX IMAGES OF THE DAY 

Svitlana Toryanik, 81, from Kharkiv who fled Russia's ongoing invasion of Ukraine, plays crosswords as she lies down at the gym turned-shelter in Lviv, Ukraine March 19, 2022. REUTERS/Zohra Bensemra 

A man who fled Russia's ongoing invasion of Ukraine, waits for his family to board the train heading to Poland, at the train station in Lviv, Ukraine March 19, 2022. REUTERS/Zohra Bensemra 

A woman sits in a tent in a metro station that is being used as a bomb shelter, as Russia's attack on Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Thomas Peter 

A bloodstain is seen on a door inside a residential building damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Mykola Tymchenko TPX IMAGES OF THE DAY 

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 

A woman is wrapped in a blanket in a subway train that is stationary in a metro station which is being used as a bomb shelter, as Russia's attack on Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Thomas Peter 

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 18, 2022. REUTERS/Alexander Ermochenko 

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

A man stands inside his apartment after a residential district was damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Marko Djurica 

Rescuers work on the remains of a building damaged by shelling, as Russia's invasion of Ukraine continues, in Kharkiv, Ukraine March 18, 2022. REUTERS/Oleksandr Lapshyn 

Bloody towel is pictured at a residential district that was damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Marko Djurica 

A view of a residential building that was damaged by an intercepted missile in Kyiv as Russia's attack on Ukraine continues, Ukraine. Picture taken with a drone. March 18, 2022. REUTERS/Thomas Peter 

Local residents cook outside a residential building during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 18, 2022. REUTERS/Alexander Ermochenko 

A man sweeps glass at a school near the place where a shell hit a residential building, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine March 18, 2022. REUTERS/Thomas Peter 

A local resident walks inside an apartment which was damaged during Ukraine-Russia conflict in the besieged southern port city of Mariupol, Ukraine March 18, 2022. REUTERS/Alexander Ermochenko 

Bloodstains are seen inside a residential building damaged by shelling, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Mykola Tymchenko 

A man carrying a dog speaks with a member of the Ukrainian military next to cars damaged by shelling in a residential district of Kyiv, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine, March 18, 2022. REUTERS/Vladyslav Musiienko 

Rescue workers move the body of a person who was killed when a shell hit a residential building, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine March 18, 2022. REUTERS/Thomas Peter