The U.S. says there will be a "firm response" as Ukrainian forces holding ground in Russia's Kursk region now face North Korean troops "engaging in combat."

The attack ended a two-month pause in missile strikes on Kyiv, which had only been hit by Russian drones during that period.

On the night of November 13, Russia launched a large-scale air attack on Ukraine, using various types of missiles, guided bombs, and attack drones. According to the Ukrainian Air Force, 96 Russian air targets were recorded.