Moscow has accused Kyiv of "postponing" the swap, while Ukraine said Russia was playing "dirty games." Meanwhile, Russia has pummelled Ukraine's Kharkiv in a massive overnight attack. Follow DW for more.

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.  The swap is set to be the largest to date of Russia’s full-scale invasion of Ukraine,

This hold-up to an exchange that both sides said would take place this weekend came hours Moscow's army launched a barrage of missiles, drones and bombs across Ukraine.