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

Reuters, the news and media division of Thomson Reuters, is the world’s largest multimedia news provider, reaching billions of people worldwide every day.

The exchange is expected to take several days.

Reuters witnesses saw and heard successive waves of drones flying over Kyiv, and a series of explosions jolted the city.

The Ukrainian Air Force said that Russia launched 14 Iskander-M/KN-23 ballistic missiles and 250 attack drones.

Trump’s lead envoy to Ukraine and Russia, Steve Witkoff, has had similar moments of confusion. In an interview in March, he could not name the regions over which the war is being fought. “These so-called four regions,” he said, struggling to recall them. “Donbas, Crimea... You know the names.”