A view of at least three rows of new graves for people killed during Russia's invasion of Ukraine, at a cemetery in Irpin, Kyiv region, Ukraine April 18, 2022. Picture taken with a drone. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY 

Natalia Evdokimova, 46, touches a photograph of her son Dmytro Evdokimov, 23, who was killed in a battlefield near Izium in Kharkiv region, as she mourns him beside his grave at the cemetery in Trostianets, Sumy region, Ukraine April 16, 2022. REUTERS/Zohra Bensemra 

Ukrainian service members take part in the Funeral of the Commander of the 2nd Separate Battalion of Ukrainian Volunteer Crops of the Right Sector Taras Bobanych, who died on April 8 in the battle near Izium, as Russia's invasion of Ukraine continues, in Lviv, Ukraine, April 13, 2022. REUTERS/Pavlo Palamarchuk 

People kneel during the funeral ceremony of Yuriy Dadak-Ruf and Taras Kryt, killed due to artillery shelling in the Luhansk region, as Russia's invasion of Ukraine continues, in Lviv, Ukraine, April 9, 2022. REUTERS/Viacheslav Ratynskyi TPX IMAGES OF THE DAY 

A new grave for a man killed during Russia's invasion of Ukraine, is seen at a cemetery in Irpin, Kyiv region, Ukraine April 19, 2022. REUTERS/Gleb Garanich 

Gravediggers fill up the grave during a funeral a man, who died during the shelling by Russian troops, amid Russia's invasion of Ukraine, at the cemetery in Irpin, Kyiv region, Ukraine April 19, 2022. REUTERS/Gleb Garanich 

People lower the coffin of Ukrainian army officer Vyacheslav Vyacheslavovych Dimov, who was killed on April 16 in battle in Vasylivka district of Zaporizhzhia region, during his funeral, amid Russia's invasion of Ukraine, in the town of Marhanets, in Zaporizhzhia region, Ukraine April 19, 2022. REUTERS/Ueslei Marcelino 

A woman reacts during a funeral of her relative, who died during the shelling by Russian troops, amid Russia's invasion of Ukraine, at the cemetery in Irpin, Kyiv region, Ukraine April 17, 2022. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY 

Ukrainian service members attend the funeral of brothers Roman and Leonid Butusin, amid Russia's invasion of Ukraine, in Kalush, Ivano-Frankivsk region, Ukraine April 4, 2022. REUTERS/Yuriy Rylchuk 

The mother of Senior Lieutenant Dmytro Oliinyk, 40, who was killed in battle amid Russia's attack on Ukraine, mourns while holding a Ukrainian national flag, during a funeral ceremony at the Lychakiv cemetery, in Lviv, Ukraine April 2, 2022. REUTERS/Alkis Konstantinidis 

Galina Bondar, 63, who said her son, Olexander Bondar, 32, a territorial defence member, was killed by Russian troops, kisses the plaque bearing his name at his grave at the cemetery in Bucha, amid Russia's invasion of Ukraine, Kyiv region, Ukraine April 17, 2022. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY 

Women attend a funeral of their a relative, who died during the shelling by Russian troops, amid Russia's invasion of Ukraine, at the cemetery in Irpin, Kyiv region, Ukraine April 19, 2022. REUTERS/Gleb Garanich 

Ukrainian service members take part in the funeral of their officer Vyacheslav Vyacheslavovych Dimov, who was killed on April 16 in battle in Vasylivka district of Zaporizhzhia region, amid Russia's invasion of Ukraine, at the town of Marhanets, in Zaporizhzhia region, Ukraine April 19, 2022. REUTERS/Ueslei Marcelino 

Ukrainian service members carry a coffin with the body of their officer Vyacheslav Vyacheslavovych Dimov, who was killed on April 16 in the battle in Vasylivka district of Zaporizhzhia region, during his funeral, amid Russia's invasion of Ukraine, at the town of Marhanets, in Zaporizhzhia region, Ukraine April 19, 2022. REUTERS/Ueslei Marcelino 

Ukrainian service members carry a coffin with the body of their officer Vyacheslav Vyacheslavovych Dimov, who was killed on April 16 in battle in Vasylivka district of Zaporizhzhia region, amid Russia's invasion of Ukraine, in the town of Marhanets, in Zaporizhzhia region, Ukraine April 19, 2022. REUTERS/Ueslei Marcelino 

Mourners gather around the coffin of Ukrainian serviceman Roman Tiaka, 47, who was killed during Russia's invasion of the Ukraine, during his funeral ceremony in Stebnyk, Lviv region, Ukraine, April 12, 2022. REUTERS/Viacheslav Ratynskyi 

Oleg Butusin, father of brothers Roman and Leonid Butusin, amid Russia's invasion of Ukraine, pours earth into a grave during their funeral in Kalush, Ivano-Frankivsk region, Ukraine April 4, 2022. REUTERS/Yuriy Rylchuk 

A worker pushes a cart past graves of Ukrainian soldiers who were killed in battle during Russia’s attack on Ukraine, at the Lychakiv cemetery in Lviv, Ukraine, March 28, 2022. Picture taken March 28, 2022. REUTERS/Alkis Konstantinidis 

People attend the funeral of a Ukrainian soldier Vasyl Vekliuk, 59, who died in a shelling near Popasna in the Luhansk region, amid Russia's invasion of Ukraine, in Stebnyk, Lviv region, Ukraine, March 30, 2022. REUTERS/Viacheslav Ratynskyi