Russia and Ukraine on Friday accused each other of shelling a prison in a separatist eastern region that reportedly killed dozens of Ukrainian prisoners of war who were captured after the fall of Mariupol in May.
Russia said that Ukraine used U.S.-supplied HIMARS multiple rocket launchers in the attack on the prison in Olenivka, in the Russian-controlled Donetsk region. Officials from Russia and the separatist authorities in Donetsk said the attack killed 53 Ukrainian POWs and wounded…