This dilemma and mess is what happens when the world sits by and watches a rogue leader ARM up.....and today that includes potentially nuclear weapons....WMD's.  You would have thought we would have learned from WWII that . you don't sit back and watch short men with funny haircuts arm themselves to the teeth.....when a child has a toy....he WANTS to and eventually WILL play with it.  China alone holds the key to peaceful capitulation by the N. Koreans...and to date, is not willing to fully make that happen.  The people in the cross hairs are in Seoul, and I fear ANY military action by anyone, will see Seoul devastated.....that is the price of non action for the last two decades.  Something has to give, and for it to be N. Korea, only China can make that happen...AND the US working with the Israeli's to "stuxnet" the N. Korean military.