Russian forces have adopted the tactic of wearing Ukrainian military uniforms on the front lines. But Ukrainian soldiers have invented an algorithm for identifying the enemy, Captain Yuriy Fedorenko,

Russian soldiers wore Ukrainian army uniforms to fight their way into the frontline city of Kupiansk, Kyiv’s military has said.

Ukrainian forces successfully repelled Russian attempts to break into the city of Kupiansk in Kharkiv Oblast, Ukrinfrom reported on Nov. 14, citing the General Staff of Ukraine's Armed Forces. Russian invaders failed to enter Kupiansk.