It is worth monitoring pro-North leftwing elements in SK. When things heat up on military front, they will also create political or social chaos in SK. In commie playbook, two go in tandem. So level of their activity can serve as another indicator. If they suddenly create political turmoil on several fronts simultaneously, it will tell you that things are getting ominous. This will be matched by non-stop belligerent rhetoric from North.
What strikes me as ominous is the tone of Gates, Mullen, Blair and Sharp.
Almost in chorus, these guys are all saying things are going to get dicey on the peninsula