A new prisoner swap between Ukraine and Russia has begun, officials in both countries said Monday, with Ukrainian soldiers who have spent nearly the entire duration of the war in captivity among those returning home.

Ukraine's president says a new prisoner exchange with Russia is ongoing and will take days, as both sides continue launching hundreds of attack drones.

By Guy Faulconbridge, Anton Kolodyazhnyy and Aleksandar Vasovic MOSCOW/KYIV (Reuters) -Russia said on Sunday its forces had advanced to the edge of the east-central Ukrainian region of Dnipropetrovsk amid a public row between Moscow and Kyiv over peace negotiations and the return of thousands of bodies of soldiers who fell in the war.