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

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.”