Four missile tests in eleven days, the latest coming on Sunday, January 16, and it is no longer doubted that North Korea has a hypersonic missile and that it isn't backing down. What policy should the U.S. now pursue and how do these developments alter U.S. responses to North Korea-South Korea conflicts? Featuring CBS Foreign Correspondent Charley D'Agata, Jeffrey Lewis of the Northeast Asia Nonproliferation Program at Middlebury Institute and Andrew Salmon, Northeast Asia Editor for the Asian Times.