So now they're making nice eh?
First off, the Korean problem is a United Nations problem... left over from 1953. It is not exclusively America's problem... it's just in our 'interests'.
S. Korea has it's own military... if it is suddenly awaking to this 'problem', I would say, “It's about time!”
IMO, using our ground forces to slug it out with the scum-bag NK's is a waste of fine, highly-trained individuals. After 50+ years of American provided assistance, South Korea should have a crack military... withable to take a suprise strike... and deal back in spades.
But most of all, it should have the will and the fortitude to do so. Unfortunately, this cannot be bought or sold... it is acquired through lessons of the past.