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, which Ukrainian officials dismissed as more “dirty games” from the Kremlin.

Russia claims Ukraine indefinitely postponed the release while Kyiv maintains it has been delayed until next week.

Officials from Russia and Ukraine wrangled about details of a large prisoner swap agreed to at recent talks in Turkey that had been expected to move ahead this weekend.