A woman reads a book as residents find shelter from shelling in a metro station, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY 

A young man eats inside a subway car, as residents find shelter from shelling in a metro station, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY 

Residents find shelter from shelling in a metro station, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis 

Alex Emelyanov, 24, speaks on the phone as residents find shelter from shelling in a metro station, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis 

A woman and her dog are seen inside in a metro station used as a shelter from shelling, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis 

A woman rests as residents find shelter from shelling in a metro station, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 11, 2022. REUTERS/Alkis Konstantinidis 

A woman and her daughter, who have been in hiding from bombardment since the beginning of the war, sit in the basement of an apartment building that serves as their bomb shelter in a neighbourhood that is left without water, gas and heating after of intensive shelling, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

Women sit in their bomb shelter where they have been hiding since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

People shelter in a metro station in northern Kharkiv from shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter TPX IMAGES OF THE DAY 

Veronika Shaposhnik, 7, sits in a stationary subway car in a metro station in northern Kharkiv where she lives with her mother to shelter from shelling in her neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Veronika moved underground with her mother 30 days ago, on the first day of the war. REUTERS/Thomas Peter 

Women are seen in their bomb shelter where they have been hiding since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

A woman helps an elderly person to walk down the stairs as they shelter in a metro station in northern Kharkiv from shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter 

Lyudmila Lazareva and her dog Rika sit in a in a metro station in northern Kharkiv with Katarina Bovt, Kolya and their son Nikita where they live to shelter from shelling in their neighbourhood, as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Lazareva has moved to the underground shelter 30 days ago after the apartment building next to hers got hit by a shell on the first day of the wa and she only leaves the station to briefly walk her dog. REUTERS/Thomas Peter 

Programming students Vladislav and Vitali Mamin study in their bomb shelter where they have been hiding with their parents since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

Lyubov Mikhailovna sits in her bomb shelter where she has been hiding since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

A woman reads in a metro station in northern Kharkiv where she lives to shelter from shelling in her neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter 

People shelter in a metro station in northern Kharkiv to escape shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter 

Igor Ostrovsky sits in his bomb shelter where he has been hiding since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

Raisa sits in a stationary subway car in a metro station in northern Kharkiv where she lives to shelter from shelling in her neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Raisa has moved underground 30 days ago on the first day of the war. REUTERS/Thomas Peter 

Katarina Bovt holds son son Nikita in a metro station in northern Kharkiv where they live to shelter from shelling in their neighbourhood as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. Bovt has moved to the underground shelter three weeks ago. REUTERS/Thomas Peter 

Igor Ostrovsky opens the door to his bomb shelter where he has been hiding since the beginning of the war in a neighbourhood that has been largely abandoned and left without water, gas and heating, as Russia's attack on Ukraine continues, in Kharkiv, Ukraine, March 28, 2022. REUTERS/Thomas Peter 

People sit in a stationary subway car in a metro station in northern Kharkiv where they live to shelter from shelling in their neighbourhood, as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter 

People who are sheltering in a metro station in northern Kharkiv receive food from volunteers as Russia's attack on Ukraine continues, Ukraine, March 24, 2022. REUTERS/Thomas Peter