U.S. Defense Secretary Chuck Hagel says North Korea is “skating very close to a dangerous line.” In the past few weeks, the North has nullified its armistice, severed its hotline and declared a state of war with South Korea. It has blocked access to a joint factory in Kaesong and vowed to restart a key nuclear complex. A medium-range missile launch is expected any day as a show of strength leading up to April 15, the 101st anniversary of state founder Kim Il-Sung’s birth. The risk of a small miscalculation or mistake sparking accidental conflict is growing. A panel of experts joins Diane to assess North Korea’s threats and how to defuse the situation.