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... Even after Hryhoriev was captured by the Russian army in 2022, his anxious family clung to the belief that he would ultimately be OK. After all, Russia is bound by international law to protect prisoners of war.

When Hryhoriev finally came home, though, it was in a body bag.

A Russian death certificate said the 59-year-old died of a stroke. But a Ukrainian autopsy and a former POW who was detained with him tell a different story about how he died " one of violence and medical neglect at the hands of his captors.

Hryhoriev is one of more than 200 Ukrainian POWs who have died while imprisoned since Russia's full-scale invasion three years ago. Abuse inside Russian prisons was likely a contributing factor in many of these deaths, according to officials from human rights groups, the U.N., the Ukrainian government and a Ukrainian medical examiner who has performed dozens of POW autopsies.

The officials say the prison death toll adds to evidence that Russia is systematically brutalizing captured soldiers. They say forensic discrepancies like Hryhoriev's, and the repatriation of bodies that are mutilated and decomposed, point to an effort to cover up alleged torture, starvation and poor health care at dozens of prisons and detention centers across Russia and occupied Ukraine. ...