US Lawmaker: North Korean Troops Fighting for Russia Would Cross 'Red Line' NewsweekAre North Korean troops fighting for Russia against Ukraine? Al Jazeera EnglishNorth Korea sends 1,500 troops to aid Russia’s war in Ukraine, South Korea’s spy agency says CNNSouth Korea says at least 1,500 North Korean special forces troops are in Russia The Washington PostNorth Korea sending more soldiers to Ukraine The Hill