Russia and Ukraine exchanged hundreds more prisoners Saturday as part of a major swap that amounted to a rare moment of cooperation in otherwise failed efforts to reach a ceasefire.

Russia launched a major attack on the Ukrainian capital Kyiv and killed at least 13 people in strikes across the country as the two sides released hundreds more prisoners on the second day of a major prisoner exchange.

Amid a historic prisoner exchange, Russia unleashed massive drone strikes over Kyiv and other Ukrainian territories. Meanwhile, drone strikes rattled Moscow, indicating the escalation of tensions