Zelenskyy condemns prison strike as a 'war crime' amid calls for U.N. and Red Cross investigations

“Russia has proven with numerous terrorist attacks that it is the biggest source of terrorism in the world today. It’s a fact,” the Ukrainian president said

RUSSIA-UKRAINE CONFLICTZelenskyy condemns prison strike as a 'war crime' amid calls for U.N. and Red Cross investigations“Russia has proven with numerous terrorist attacks that it is the biggest source of terrorism in the world today. It’s a fact,” the Ukrainian president said.TAP TO UNMUTE

There should be “a clear, legal recognition of Russia as a state sponsor of terrorism,” Ukrainian President Volodmyr Zelenskyysaid late Friday after dozens of prisoners of war were killed in an attack both sides traded blame for.

Calling the strike on a prison in a Russian-controlled territory a “war crime,” Zelenskyy said in a late-night video address that Moscow had “proven with numerous terrorist attacks that it is the biggest source of terrorism in the world today.”

A destroyed barrack at a prison damaged in a missile strike in Olenivka, 

kraine on Friday.AP

Kremlin-backed separatists in the Donetsk region said Friday that the attack on the detention facility in the town of Olenivka killed 53 prisoners of war, including some captured after the fall of Mariupol in May. They said 75 others were injured.

Russia denied it was behind the attack and has instead accused Ukraine of using a U.S.-supplied rocket system to hit the detention facility near the eastern front lines.

NBC News has not been able to independently verify the claims of either side.