On December 21, local time, the Russian Ministry of Defense released a war report saying that in the past day, the Russian army occupied more favorable lines of defense and positions in all directions and advanced in depth against the Ukrainian army. The Russian military attacked Ukrainian military enterprises, providing security for the Ukrainian military's energy, transportation, and storage infrastructure, remote drone assembly sites, and temporary stationing sites for the Ukrainian military and foreign mercenaries. On the 21st, the Ukrainian armed forces said that due to the rapid advance of the Russian army, the Ukrainian army had withdrawn from several positions in Krasnopilia in Sumy near the Russian-Ukrainian border. Currently, the Ukrainian army continues to carry out operations in the border area to eliminate the Russian army's vital strength. Currently, the Russian army is being attacked by Ukrainian military fire.

On December 21, local time, the Russian Ministry of Defense released a war report saying that in the past day, the Russian army occupied more favorable lines of defense and positions in all directions and advanced in depth against the Ukrainian army. The Russian military attacked Ukrainian military enterprises, providing security for the Ukrainian military's energy, transportation, and storage infrastructure, remote drone assembly sites, and temporary stationing sites for the Ukrainian military and foreign mercenaries. On the 21st, the Ukrainian armed forces said that due to the rapid advance of the Russian army, the Ukrainian army had withdrawn from several positions in Krasnopilia in Sumy near the Russian-Ukrainian border. Currently, the Ukrainian army continues to carry out operations in the border area to eliminate the Russian army's vital strength. Currently, the Russian army is being attacked by Ukrainian military fire.