Russia said Sunday that trains carrying more bodies of Ukrainian soldiers were due to depart toward the Ukrainian border, escalating a spat with Kyiv over a prisoner of war swap. “I can tell you that in just an hour,

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.

Russian presidential aide urges Ukraine to "strictly adhere to the schedule and all agreements reached, and to immediately begin exchange"