The world breathed a sigh of relief on Monday when North Korea announced it would not retaliate in response to military exercises by the South Koreans over the weekend. Why did Pyongyang back down? Where does that leave the Korean peninsula now? What should the Obama administration be pursuing with respect to its Korea policy? And can the United Nations be counted upon to have any leverage against North Korea? We ask former U.S. Ambassador to the United Nations, John Bolton.