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.

Russia and Ukraine wrangled over details of a large prisoner swap, with officials in Kyiv rejecting claims by a Russian negotiator that they were dragging their feet on the planned exchange.

A large-scale prisoner exchange between Russia and Ukraine – the only concrete outcome of peace talks – was thrown into doubt on Saturday local time after Moscow and Kyiv accused each other of delaying and thwarting the swap.