[Bendingo]

> the U.S. must play theirs

Or, as the far stronger side, the US could de-escalate. Not only is this the less-risky option, but it would also garner global respect/admiration for the US - something that has been in short supply for a long time.

[microcolonel]

How do you suggest they de-escalate (without the use of military posturing) a situation where DPRK threatens the very existence of two of our greatest allies, perpetually? I'm sure you realize that if DPRK is left to their own devices, they will develop a sufficient deterrent to simply saunter into ROK, and face no foreign intervention.