"No, North Korea would not have much trouble invading the South, but that would be a fight that would be the end of the North Korean state as we know it."

I agree, entirely, but so what? The question is what the N. Korean government thinks, not what we think, or what actually might happen.


"South Korea could defend itself,"

Not really.


"and not only would the U.S. intervene "

With what forces? This would have to be a WMD response, as I said.


- Japan would do all it could and the Chinese "back door" would be locked and bolted, unlike during the 50s. "

Also true, but would that be enough to stop the N. Koreans? I do not think so, but there is room for debate on that.