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."

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.

North Korean soldiers, who were previously sent to Russia, are now in Kursk Oblast and are "already engaging in combat" operations against Ukraine. Source: Yonhap, citing South Korea's spy agency Details: The intelligence service reported that "North Korean soldiers dispatched to Russia have moved to Kursk Oblast over the past two weeks and their deployment to battlefields has been completed".