12.Washington is echoing earlier warnings from Kyiv that Pyongyang's troops have been deployed in the warzone in an unprecedented escalation of Russia's war against Ukraine."Today I can confirm that over 10,000 (North Korean) soldiers have been sent to eastern Russia, and most of them have moved to the far western Kursk Oblast, where they have begun engaging in combat operations with Russian forces," spokesperson Vedant Patel said."Russian forces have trained the (North Korean) soldiers in artillery, in UAV and basic infantry operations, including trench clearing, which are critical skills for front-line operations."According to Patel, the effectiveness of North Korean soldiers will "in large part be dictated by how well the Russians can integrate them into their military."Russia is mustering a force of 50,000 soldiers, including North Korean troops, to launch a counter-offensive against a Ukrainian salient in Russia's Kursk Oblast, the New York Times reported on Nov.