FILE - Ukrainian soldiers sit in a bus in the Sumy region of Ukraine after returning from captivity in Russia, May 31, 2024. (AP Photo/Evgeniy Maloletka, File)

Fingerprints taken from the body of a Ukrainian prisoner of war returned by Russia, at a morgue in Kyiv, Ukraine, June 24, 2024. (AP Photo/Alex Babenko)

Halyna Hryhorieva, the wife of Serhii Hryhoriev, a prisoner of war who died in Russia, sits at home in Pyriatyn, Ukraine, March 9, 2025. (AP Photo/Alex Babenko)

A portrait of Serhii Hryhoriev, a Ukrainian prisoner of war who died in Russia, is seen next to his grave in Pyriatyn, Ukraine, March 9, 2025. (AP Photo/Alex Babenko)