Russia launched 550 drones and missiles across Ukraine overnight in the largest aerial assaults since the war began. The capital Kyiv was the primary target.

It was the latest in a series of almost weekly large-scale missile and drone attacks. President Trump said he “didn’t make any progress” with President Vladimir V. Putin of Russia.

Russia launched its largest-ever drone and missile barrage on Ukraine, two days after the US stopped the delivery of some key weapons to Kyiv — including crucial interceptors used to shoot down Moscow’s missiles.