The Dear Leader knows he is safe from the US as he has no oil, a credible WMD threat and is not posing a real threat to CONUS. He also knows that should he - even for a moment - look like starting something the Chinese will steamroller his little slice of 1950 and have him shot.
Why has nobody yet picked up on the fact that the article posted so melodramatically by NEO_CON is entirely speculative? Nowhere does it say that this is actually going to happen. It's all "appears" and "seems to" stuff. It's making news of a vague notion!
Can't see them actually being mad enough to shoot the thing down - especially if the N Koreans are able to claim this is a test of a satellite lauch vehicle.
But imagine if they did - helluva live test for the American system... if it works.