Pro-Russian separatists have so far handed over 648 prisoners-of-war to the Ukrainian side under the terms of a cease-fire agreement, 500 more are to be handed over soon.
Press-secretary of Ukrainian President Petro Poroshenko Svyatoslav Tsegolko announced.
The two sides are meant to exchange all their POWs under the terms of the cease-fire deal, agreed September 5.
The statement comes after Poroshenko’s visit to Mariupol, a port city in the east of Ukraine which the rebels advanced towards last week before the ceasefire took effect.
During his visit, Poroshenko announced he has ordered reinforced defense of Mariupol with tanks, rocket launchers, and aerial defense.
Despite the truce, Ukrainian troops have come under fire from pro-Russian rebels on the eastern edge of Mariupol.