FILE - Photos of Ukrainian POWs killed in the explosions at the Russian-controlled barracks in Olenivka, eastern Ukraine, are placed around a memorial in Kyiv, Ukraine, Saturday, July 29, 2023, to mark the first-year anniversary of the attack. (AP Photo/Jae C. Hong, File)
FILE - This image from video shows the damaged barracks at the Russian-controlled Olenivka prison in Olenivka, eastern Ukraine, on July 29, 2022. An AP investigation interviewed survivors, family and investigators and obtained an internal U.N. analysis. All pointed to Russia as the culprit. (AP Photo/File)
Lt. Col. Ihor Benzeruk, a Ukrainian soldier who survived the explosions at the Russian-controlled Olenivka prison two years ago, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. "Thanks to the herd instinct, I managed to get out. For me, this day remains as the day my comrades were executed," Benzeruk said. (AP Photo/Evgeniy Maloletka)
Maj. Oleksii Bordun, a Ukrainian soldier known as Satyrenko who survived the explosions at the Russian-controlled Olenivka prison two years ago, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. “For me and for all of us, this day is a tragedy,” Bordun said. (AP Photo/Evgeniy Maloletka)
Sgt. Kyrylo Masalitin, known as Maslo, who survived the explosion at the Russian-controlled Olenivka prison two years ago that killed more than 50 Ukrainian POWs, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. "In front of my eyes, there were guys who were dying, who were being revived, but it was all in vain," said Masalitin. (AP Photo/Evgeniy Maloletka)
Lt. Col. Ihor Benzeruk, a Ukrainian soldier who survived the explosions at the Russian-controlled Olenivka prison two years ago, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. "Thanks to the herd instinct, I managed to get out. For me, this day remains as the day my comrades were executed," Benzeruk said. (AP Photo/Evgeniy Maloletka)
EDS NOTE: GRAPHIC CONTENT - FILE - The burned body of a Ukrainian POW lies in the destroyed barracks of the Russian-controlled prison in Olenivka, eastern Ukraine on Friday, July 29, 2022. More than 50 Ukrainians died and dozens were wounded. (AP Photo/File)
FILE - Soldiers carry the coffin of Andrii Konyaev, a member of the Azov unit, during his funeral in Fastiv, Ukraine, on Tuesday, May 23, 2023. He and more than 50 Ukrainians died in the July 29, 2022, explosions at Olenivka, a Russia-controlled prison camp in eastern Ukraine. (AP Photo/Evgeniy Maloletka, File)
FILE - Journalists visit the destroyed barracks at the Russian-controlled Olenivka prison holding Ukrainian POWs in eastern Ukraine, on Aug. 10, 2022. Russia blamed Ukraine at the time but interviews with survivors witnesses and families of the missing as well as an internal U.N. analysis pointed to Russia as the culprit two years later. (AP Photo/File)3
FILE - A girl holds a photo of a Ukrainian POW killed in the 2022 explosions at the Russian-controlled prison barracks in Olenivka, eastern Ukraine, during a memorial in Kyiv on July 29, 2023. An AP investigation interviewed survivors, family and investigators and obtained an internal U.N. analysis. All pointed to Russia as the culprit. (AP Photo/Jae C. Hong, File)
Oksana, the mother of a Ukrainian serviceman who was killed in the 2022 explosions at the Olenivka prison, stands near the grave of her son at a cemetery in Kremenchuk, Donetsk region, Ukraine, Friday, July 12, 2024. An AP investigation interviewed survivors, family and investigators and obtained an internal U.N. analysis. All pointed to Russia as the culprit.(AP Photo/Evgeniy Maloletka)
Mariia Alieksieievych, whose husband Serhii survived the explosions at the Russian-controlled Olenivka prison but is still a POW, attends a protest in Vinnitsia, Donetsk region, Ukraine, Saturday, July 13, 2024. Mariia last caught sight of him in his hospital bed in a video circulating on Russian media, slowly answering questions as he recovered from his injuries. (AP Photo/Evgeniy Maloletka)
FILE - Leonid Konyaev and Valentina Konyaeva cry over the coffin of their son, Andrii Konyaev, a member of the Azov unit, during his funeral in Fastiv, Ukraine, on Tuesday, May 23, 2023. He and more than 50 Ukrainians died in the July 29, 2022, explosions at Olenivka, a Russia-controlled prison camp in eastern Ukraine. (AP Photo/Evgeniy Maloletka, File)
Sgt. Kyrylo Masalitin, known as Maslo, who survived the explosion at the Russian-controlled Olenivka prison two years ago that killed more than 50 Ukrainian POWs, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. "In front of my eyes, there were guys who were dying, who were being revived, but it was all in vain," said Masalitin. (AP Photo/Evgeniy Maloletka)
Maj. Oleksii Bordun, a Ukrainian soldier known as Satyrenko who survived the explosions at the Russian-controlled Olenivka prison two years ago, sits for a portrait in Lyman, Donetsk region, Ukraine, Thursday, July 11, 2024. “For me and for all of us, this day is a tragedy,” Bordun said. (AP Photo/Evgeniy Maloletka)
FILE - People hold signs outside the Russian embassy in Kyiv, Ukraine, on July 29, 2023, to mark the anniversary of the attack on the Russian-controlled prison barracks in Olenivka, eastern Ukraine, that killed dozens of Ukrainian POWs. An AP investigation interviewed survivors, family and investigators and obtained an internal U.N. analysis. All pointed to Russia as the culprit. (AP Photo/Jae C. Hong, File)