North Korean troops spotted in Russian border region with Ukraine, says Kyiv CNNNorth Korean troops fighting for Russia in Ukraine ‘fair game,’ U.S. warns Putin NBC NewsWhy Is North Korea Deploying Troops to Help Russia? Here’s What to Know. The New York TimesHouse intel chair: US should consider military action if North Korean troops enter Ukraine USA TODAYNorth Korea knows its troops could desert in Ukraine. It has chilling ways to keep them in line. Business Insider