China To Act as Guarantor for U.S.-North Korea Deal?

A high-ranking Chinese military delegation is in the midst of a weeklong visit to North Korea to discuss bilateral ties. At the same time, the delegation is trying to give assurances that China will guarantee Washington keeps its promise about any security assurances U.S. officials might offer for Pyongyang's shutdown of its nuclear program. The big questions are: What can China offer and, in the end, does it really matter?