Video: Why are North Korean troops in Russia?

Over the past month, North Korea's role in helping Russia in the war in Ukraine has escalated significantly. US officials reported that North Korean soldiers are already active in the Kursk region of western Russia, where Ukrainian forces are waging a counter-offensive. Michael Shear, White House correspondent for DailyExpertNews, explains what the deep relationship between Russia and North Korea means for the war in Ukraine and the world.