U.S. President Donald Trump met with Ukrainian President Volodymyr Zelenskyy on August 18 in the Oval Office, alongside European leaders from Germany, France, and the United Kingdom. The meeting followed Trump’s August 15 summit with Russian President Vladimir Putin in Anchorage, Alaska.

Monday night's attack was the largest attack since Russia launched 309 drones and eight missiles into Ukraine on July 31, according to the daily figures published by the Ukrainian air force and analyzed by ABC News. Russia's Defense Ministry, meanwhile, said its forces shot down 23 Ukrainian drones overnight into Tuesday morning.