Hmm, the South have been hell bent on keeping the cease fire since it was placed into effect. The warship incident earlier was probably a bigger deal than this, militarily, and the South kept their cool.
Also, I believe the terms of the ceasefire means that if the war goes hot again, we'll be forced to get involved for a second time.
That passage in the article about the North not getting the desired response is undoubtedly correct.
Also, I believe there's an extremely high rate of defection among the North's forces, or at least the Air Force. (Jeez, I wonder why?) Their flying hours are literally less than ten a year, from memory.
I think those in the higher echelons of the North's military know that they really don't have the training nor the purple coordination necessary to sustain a war against what is undoubtedly going to be an alliance of Western nations, keeping within the terms of the ceasefire at the very least.
I hope for the sake of all involved that the Chinese can talk the North out of whatever they're playing at here. We all know how bloody land wars in Asia turn out to be.