North Korea exists because China wanted them to exist; it was true in the 1950's and is ten time more true with China being a superpower. China needs to ask itself this, does he want NK to be their version of Israel?, a parasite punk that makes messes because it knows big brother will always have to clean up.
Case closed. Lets go harass someone who doesn't. Iran comes to mind.
hopefully they will not be so foolish. the stakes are much higher for them.
Unless you are reading a right wing site. The US has an obligation to defend South Korea if North Korea attacks.