Video: Why Are North Korean Troops in Russia?

Over the last month, North Korea’s role aiding Russia in its war in Ukraine has significantly escalated. U.S. officials reported that North Korean soldiers are already operating in the Kursk region in western Russia, where Ukrainian forces are staging a counteroffensive. Michael Shear, a White House correspondent for The New York Times, explains what the deeping relationship between Russia and North Korea means for the war in Ukraine and the world.