A second round of peace talks between Russia and Ukraine have ended without a major breakthrough, and only an agreement between the warring sides to swap more prisoners of war. The Ukrainian negotiators said Russia again rejected an "unconditional ceasefire" - a key demand by Kyiv and its allies in Europe and the US.

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Of the more than 5,000 POWs Russia has repatriated to Ukraine, at least 206 died in captivity, including more than 50 when an explosion ripped through a Russian-controlled prison barracks, according to the Ukrainian government. An additional 245 Ukrainian POWs were killed by Russian soldiers on the battlefield, according to Ukrainian prosecutors.