The attack involved nearly 370 missiles and drones, according to Ukraine’s Air Force. At least 12 people were killed.

The missile and drone attack casts more doubt on the U.S.-brokered peace process. President Volodymyr Zelensky condemned the “silence of America and others around the world.”

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