It's China's problem more than ours.  I mean, if North Korea slips into anarchy, the Chinese don't want to have to bail them out - they have their own large population to consider.

More interesting to me is that within 72 hours there should be enough analyzed data to determine whether it was actually a nuclear bomb that exploded.  Apparently there are tell-tale signatures that provide conclusive proof and it will take that long to know for sure.  On the other hand, because the size of the bomb was so small, we may never really know for sure one way or the other. 

We "contained" Iraq and a lot of kids died.  It's not an ideal solution.  Someone said today that NK can either have the WMDs or they can join the rest of the world community but they can't have both.