A planned exchange of Russian and Ukrainian prisoners of war failed to take place on Saturday, with Moscow accusing Kyiv of postponing the swap at the last minute, something Ukrainian officials dismissed as “dirty games” from the Kremlin.

Ukraine and Russia, earlier this month, agreed to exchange 1,000 prisoners of war and civilian detainees each in a rare moment of cooperation in more than three years of war.

Ukraine and Russia agreed another large-scale prisoner exchange at talks in Istanbul, but failed to make a breakthrough on an immediate halt to the fighting.