North Korea said it successfully tested a hydrogen bomb on Sunday, following an explosion that caused a magnitude 6.3 earthquake and yielded more power than the bombs dropped on Hiroshima and Nagasaki. President Trump issued a series of tweets in the days following, accusing the South Koreans of appeasement and suggesting the U.S. stop trade with countries doing business in North Korea. Meanwhile, Vladimir Putin said Tuesday that the intensifying rhetoric between the U.S. and Pyonyang could lead to "global catastrophe." We speak to James Stavridis, former supreme allied commander for NATO, about the escalating North Korean crisis and about his new book, 'Sea Power: The History and Geopolitics of the World's Oceans.'
Admiral James Stavridis, dean, Fletcher School of Law and Diplomacy, Tufts University; former commander, NATO; author, "Sea Power: The History and Geopolitics of the World's Oceans"