Ukrainian service members fire a SPG-9 anti-tank grenade launcher during military drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

Ukrainian service members attend a military exercise during drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

Ukrainian service members attend a military exercise during drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

A Ukrainian service member fires a RPG-7 anti-tank grenade launcher during military drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

Ukrainian service members attend a military exercise during drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

Ukrainian service members attend a military exercise during drills at a training ground, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 28, 2023. REUTERS/Stringer 

A view shows a heavily damaged residential building hit by a Russian missile, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

Rescuers work at the site of a heavily damaged residential building hit by a Russian missile, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

Rescuers work at the site of a heavily damaged residential building hit by a Russian missile, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

Bodies of killed people are seen at a site of a Russian missile attack, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

A rescuer works at the site of a heavily damaged residential building hit by a Russian missile, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

A view shows a heavily damaged residential building hit by a Russian missile, amid Russia's attack on Ukraine, in the town of Uman, Cherkasy region, Ukraine April 28, 2023. REUTERS/Sergiy Karazy 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, poses for a picture at a platform of a subway station where he spent few months with locals amid Russia's attack on Ukraine, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, enters a subway station where he spent few months with locals amid Russia's attack on Ukraine, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, treats a girl with cookies outside of his cafe, amid Russia's attack on Ukraine, in Kharkiv, outside of his cafe in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, walks past a building damaged by a Russian military strike, amid Russia's attack on Ukraine, in Kharkiv, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, passes free food to people at his cafe, amid Russia's attack on Ukraine, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, greets local people who came for free food, amid Russia's attack on Ukraine, in Kharkiv, outside of his cafe in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, looks through a window of his cafe, amid Russia's attack on Ukraine, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Fuminori Tsuchiko, 75-year-old humanitarian volunteer from Japan, passes free food to people at his cafe, amid Russia's attack on Ukraine, in Kharkiv, Ukraine April 24, 2023. REUTERS/Viktoriia Yakymenko 

Ukrainian service members from a 3rd separate assault brigade of the Armed Forces of Ukraine, fire a howitzer D30 at a front line, amid Russia's attack on Ukraine, near the city of Bakhmut, Ukraine April 23, 2023. REUTERS/Sofiia Gatilova 

Ukrainian service members from a 3rd separate assault brigade of the Armed Forces of Ukraine, are seen at a front line, amid Russia's attack on Ukraine, near the city of Bakhmut, Ukraine April 23, 2023. REUTERS/Sofiia Gatilova 

A Ukrainian service member from a 3rd separate assault brigade of the Armed Forces of Ukraine, fire a howitzer D30 at a front line, amid Russia's attack on Ukraine, near the city of Bakhmut, Ukraine April 23, 2023. REUTERS/Sofiia Gatilova TPX IMAGES OF THE DAY 

Agricultural worker Oleksii stands next to a used shell from a heavy multiple launch rocket system pulled by a tractor in a field during a sowing of lentils, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Agricultural worker Roman controls a tractor during a sowing of lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Agricultural worker Oleksii walks next to a used shell from a heavy multiple launch rocket system as tractor driver Roman pulls it in a field during a sowing of lentils, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Agricultural worker Roman controls a tractor during a sowing of lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Agricultural worker Roman controls a tractor during a sowing of lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

A shell from a heavy multiple launch rocket system is seen if front of a tractor during a sowing of lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer TPX IMAGES OF THE DAY 

Agricultural worker Oleksii stands atop a sowing machine as he plants lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Agricultural workers Roman and Oleksii pull a used shell from a heavy multiple launch rocket system during a sowing of lentils in a field, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine April 18, 2023. REUTERS/Stringer 

Drivers prepare food near their trucks as they wait for crossing the Ukraine-Poland border, amid Russia's attack on Ukraine, at the checkpoint Rava-Ruska, Lviv region, Ukraine April 17, 2023. REUTERS/Roman Baluk 

Trucks wait for crossing the Ukraine-Poland border, as Russia's attack on Ukraine continues, at the checkpoint Rava-Ruska, Lviv region, Ukraine April 17, 2023. REUTERS/Roman Baluk 

Trucks wait for crossing the Ukraine-Poland border, as Russia's attack on Ukraine continues, at the checkpoint Rava-Ruska, Lviv region, Ukraine April 17, 2023. REUTERS/Roman Baluk 

Trucks wait for crossing the Ukraine-Poland border, as Russia's attack on Ukraine continues, at the checkpoint Rava-Ruska, Lviv region, Ukraine April 17, 2023. REUTERS/Roman Baluk 

Trucks wait for crossing the Ukraine-Poland border, as Russia's attack on Ukraine continues, at the checkpoint Rava-Ruska, Lviv region, Ukraine April 17, 2023. REUTERS/Roman Baluk 

Metropolitan Epiphanius I, head of the Orthodox Church of Ukraine sprinkles holy water on boxes with Easter cakes which will be transferred to Ukrainian servicemen fighting on frontline, amid Russia's attack on Ukraine, during a ceremony to bless Easter cakes near a St Michael’s Cathedral before Orthodox Easter in Kyiv, Ukraine April 12, 2023. REUTERS/Vladyslav Musiienko REFILE - CORRECTING INFORMATION 

Metropolitan Epiphanius I, head of the Orthodox Church of Ukraine sprinkles holy water on Ukrainian servicemen with Easter cakes during a special service for Ukrainian Armed Forces, amid Russia's attack on Ukraine, during a ceremony to bless Easter cakes at St Michael’s Cathedral before Orthodox Easter in Kyiv, Ukraine April 12, 2023. REUTERS/Vladyslav Musiienko REFILE - CORRECTING INFORMATION 

Local resident Mykola Lobko, 72, stands among remains of his house destroyed last year by a military strike in the village of Studenok, Kharkiv region, Ukraine April 10, 2023. REUTERS/Sofiia Gatilova 

A local resident removes debris from his house damaged by a Russian missile strike, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

Rescuers are seen inside a residential house destroyed by a Russian missile strike, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

A volunteer inspects remains of a residential house damaged by a Russian missile strike, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

A police officer inspects remains of a Russian missile which hit a residential area, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

A volunteer inspects remains of a residential house damaged by a Russian missile strike, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

A mobile phone is seen on a table in a kitchen of a residential house destroyed by a Russian missile strike, amid Russia's attack on Ukraine, in Zaporizhzhia, Ukraine April 9, 2023. REUTERS/Stringer 

A view shows school No. 9, where Russian citizen Alexei Moskalyov's daughter Maria studied before Alexey was accused of discrediting the country's armed forces, in the town of Yefremov in the Tula region, Russia, April 5, 2023. REUTERS/Evgenia Novozhenina 

Two-years-old Leia looks on next to a coffin with the body of her father Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during his funeral ceremony in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

Athletes and colleagues react next to a coffin with the body of Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during a funeral ceremony in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People pray during a funeral ceremony for Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

Athletes, friends and colleagues react next to the tomb of Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, after a funeral ceremony at a cemetery in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People react next to a coffin with the body of Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during his funeral ceremony in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

Members of the National Guard of Ukraine carry a coffin with the body of the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during a funeral ceremony in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People attend a funeral ceremony for Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People knee during a funeral ceremony for the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People attend a funeral ceremony for the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People knee during a funeral ceremony for the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

Wife Vita and brother Serhii react next to a coffin with the body of Vitalii Merinov, the four-time world kickboxing champion and Ukrainian serviceman, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during a funeral ceremony in Ivano-Frankivsk, Ukraine April 3, 2023. REUTERS/Yuriy Rylchuk 

People knee during a funeral procession for the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 2, 2023. REUTERS/Yuriy Rylchuk 

Athletes, friends and colleagues knee next to the coffin with the body of the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, during a funeral procession in front of a sports club founded by Vitalii in Ivano-Frankivsk, Ukraine April 2, 2023. REUTERS/Yuriy Rylchuk 

People knee during a funeral procession for the four-time world kickboxing champion and Ukrainian serviceman Vitalii Merinov, who was deadly injured in a fight against Russian troops in Luhansk region, amid Russia's attack on Ukraine, in Ivano-Frankivsk, Ukraine April 2, 2023. REUTERS/Yuriy Rylchuk