Seoul vows response as North Korean troops head to Ukraine The Associated PressChina May Chafe as North Korea Sends Soldiers to Fight Ukraine The New York TimesKim Jong Un sending soldiers to Russia complicates Putin’s BRICS summit NBC NewsKey Republican: US should consider ‘direct military action’ if North Korean troops enter Ukraine The HillNorth Korean troops in Ukraine ‘fair game’, US warns Russia as war rages on Al Jazeera English