Ukrainian servicemen patrol an area, as Russia's attack on Ukraine continues, in an undisclosed location in Kharkiv Region, Ukraine May 10, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman rests as he patrols an area, as Russia's attack on Ukraine continues, in an undisclosed location in Kharkiv Region, Ukraine May 10, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman patrols an area, as Russia's attack on Ukraine continues, in an undisclosed location in Kharkiv Region, Ukraine May 10, 2022. REUTERS/Serhii Nuzhnenko TPX IMAGES OF THE DAY 

Russian main battle tank T-90M Proryv destroyed by Ukrainian Armed Forces is seen near the village of Staryi Saltiv, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

Russian main battle tank T-90M Proryv destroyed by Ukrainian Armed Forces is seen near the village of Staryi Saltiv, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

Ukrainian serviceman walks next to a destroyed Russian main battle tank T-90M Proryv, as Russia's attack on Ukraine continues, near the village of Staryi Saltiv in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

Russian main battle tank T-90M Proryv destroyed by Ukrainian Armed Forces is seen near the village of Staryi Saltiv, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

Ukrainian serviceman walks next to a destroyed Russian main battle tank T-90M Proryv, as Russia's attack on Ukraine continues, near the village of Staryi Saltiv in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

Russian main battle tank T-90M Proryv destroyed by Ukrainian Armed Forces is seen near the village of Staryi Saltiv, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine May 9, 2022. Picture taken May 9, 2022. REUTERS/Vitalii Hnidyi 

A Ukrainian serviceman puts a shell into a mortar at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian servicemen rest at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian servicemen fire with a mortar at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian serviceman prepare a mortar for shelling at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman fires with a mortar at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko TPX IMAGES OF THE DAY 

A Ukrainian serviceman carries a mortar shell at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman carries a mortar shell at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

A Ukrainian serviceman carries a mortar shell at a position, as Russia's attack on Ukraine continues, at an unknown location in Kharkiv region, Ukraine May 9, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian service members fire with a self-propelled howitzer 2S1 Gvozdika, as Russia's attack on Ukraine continues, in unknown location in Kharkiv region, Ukraine May 7, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian service members fire with self-propelled howitzers 2S1 Gvozdika, as Russia's attack on Ukraine continues, in unknown location in Kharkiv region, Ukraine May 7, 2022. REUTERS/Serhii Nuzhnenko 

A local resident rides a bicycle past a self-propelled howitzer 2S1 Gvozdika, as Russia's attack on Ukraine continues, in unknown location in Kharkiv region, Ukraine May 7, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian service members fire with a self-propelled howitzer 2S1 Gvozdika, as Russia's attack on Ukraine continues, in unknown location in Kharkiv region, Ukraine May 7, 2022. REUTERS/Serhii Nuzhnenko 

Employees remove the statue of Ukrainian philosopher Hryhoriy Skovoroda after a Russian bombing hit the Hryhoriy Skovoroda Literary Memorial Museum, amid Russia's attack on Ukraine, in Skovorodynivka village near Kharkiv, Ukraine, May 7, 2022. REUTERS/Ricardo Moraes 

Burnt items are pictured after a Russian bombing hit the Hryhoriy Skovoroda Literary Memorial Museum, amid Russia's attack on Ukraine, in Skovorodynivka village near Kharkiv, Ukraine, May 7, 2022. REUTERS/Ricardo Moraes 

A man walks outside the Hryhoriy Skovoroda Literary Memorial Museum after a Russian bombing hit it, amid Russia's attack on Ukraine, in Skovorodynivka village near Kharkiv, Ukraine, May 7, 2022. REUTERS/Ricardo Moraes 

People carry the statue of Ukrainian philosopher Hryhoriy Skovoroda after a Russian bombing hit the Hryhoriy Skovoroda Literary Memorial Museum, amid Russia's attack on Ukraine, in Skovorodynivka village near Kharkiv, Ukraine, May 7, 2022. REUTERS/Ricardo Moraes 

War World II veteran, Ivan Lisun, 97, wears a jacket with his medals and pins outside his house which was damaged after a Russian bombing, amid Russia's attack on Ukraine, in Zolochiv near Kharkiv, Ukraine, May 6, 2022. Picture taken May 6, 2022. REUTERS/Ricardo Moraes 

War World II veteran, Ivan Lisun, 97, wears a jacket with his medals and pins outside his house which was damaged after a Russian bombing, amid Russia's attack on Ukraine, in Zolochiv near Kharkiv, Ukraine, May 6, 2022. Picture taken May 6, 2022. REUTERS/Ricardo Moraes 

War World II veteran, Ivan Lisun, 97, wears a jacket with his medals and pins outside his house which was damaged after a Russian bombing, amid Russia's attack on Ukraine, in Zolochiv near Kharkiv, Ukraine, May 6, 2022. Picture taken May 6, 2022. REUTERS/Ricardo Moraes 

War World II veteran, Ivan Lisun, 97, wears a jacket with his medals and pins outside his house which was damaged after a Russian bombing, amid Russia's attack on Ukraine, in Zolochiv near Kharkiv, Ukraine, May 6, 2022. Picture taken May 6, 2022. REUTERS/Ricardo Moraes 

A phone hangs on a damaged building in Chuhuiv, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

A Ukrainian soldier poses next to a destroyed Russian tank in Malaya Rohan village, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

74 years old Osmachko Vasylii Oleksiiovych gestures as he stands outside his damaged house in Malaya Rohan village, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

A damaged building is pictured in Malaya Rohan village, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

An elderly man walks past a damaged house in Malaya Rohan village, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

A damaged residencial area is pictured in Chuhuiv, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

A resident walks past a destroyed Russian tank in Malaya Rohan village, amid Russia's attack on Ukraine, near Kharkiv, Ukraine, May 5, 2022. REUTERS/Ricardo Moraes 

Ukrainian servicemen repair a tank at a position, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine May 1, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian servicemen are seen near a T-80 tank captured from Russian troops, as Russia's attack on Ukraine continues, at a position in Kharkiv region, Ukraine May 1, 2022. REUTERS/Serhii Nuzhnenko 

Ukrainian servicemen are seen near a T-80 tank captured from Russian troops, as Russia's attack on Ukraine continues, at a position in Kharkiv region, Ukraine May 1, 2022. REUTERS/Serhii Nuzhnenko 

People walk at a damaged area inside a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A man smokes outside a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

People walk at a damaged area inside a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A person looks through a gate outside a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A person carries buckets as he works to extinguish a fire at a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A firefighter walks as he works to extinguish a fire at a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A firefighter stands as he works to extinguish a fire at a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

Firefighters try to extinguish a fire at a burning plant, following Russian shelling amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 30, 2022. REUTERS/Ricardo Moraes 

A damaged building is pictured, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 29, 2022. REUTERS/Ricardo Moraes 

A damaged building is pictured, amid Russia's attack on Ukraine, in Kharkiv, Ukraine, April 29, 2022. REUTERS/Ricardo Moraes