Russia and Ukraine accused one another on Friday of bombing a prison in separatist-held eastern Ukraine, which killed scores of Ukrainian prisoners of war.
Russia's defence ministry said Ukrainian forces "fired on the prison where members of the Azov battalion are being held, using American projectiles from the Himars system."
It reported that at least 40 Ukrainian POWs were killed and 84 others wounded in the strike on Olenivka prison, while pro-Russian separatist authorities in the Donetsk region put the death toll at 53.
The Ukrainian army says it "never conducted" strikes on civilian infrastructure or prisoners of war.
The Azov regiment distinguished itself by holding out against Russian troops in a steel mill in Mariupol, southeastern Ukraine.
After three long weeks of relentless siege, some 2,500 Ukrainian fighters surrendered in May. They were imprisoned in Olenivka, according to Russia.
"This outrageous provocation aims to scare Ukrainian soldiers and dissuade them from surrendering," the Russian Defense Ministry said.
Ukraine denied targeting civilian infrastructure or prisoners of war, stressing that its army "fully adheres to the principles and standards of international humanitarian law."
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Ukrainian president Volodymyr Zelenskyy has visited a port in southern Ukraine to oversee grain being loaded for export onto a Turkish ship, following a deal with Russia brokered by the UN and Turkey.
"The first vessel, the first ship is being loaded since the beginning of the war. This is a Turkish vessel," Zelenskyy said, according to a statement from the presidency.
Video footage from the Chornomorsk port released by the presidency showed him in front of a ship called Polarnet.
The statement said exports could start in
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