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."

South Korean and US intelligence services have confirmed the participation of North Korean soldiers in hostilities in Russia, particularly in Kursk Oblast. Source: ISW Details: South Korea's National Intelligence Service reported on 13 November that North Korean troops were participating in hostilities in Russia,

According to assessments by the National Intelligence Service, North Korean forces deployed to Russia have moved to Kursk Oblast over the past two weeks,” intelligence officials noted. North Korean soldiers have now completed battlefield deployment and are actively engaged in combat.