may not even need to fire anything- just set the damn thing off!  sure, the blast would spread in 360 degrees and ~1/2 would head out to the Pacific but still... enough damage to destroy ... no missiles, no tell tale track... the unknown assailant.. could even be rogue Russians.

Speaking of which, I was reading a defense / security analysis re NK's suddenly 'odd' fast track to both the development of a true ICBM (rocket motor) and 'weaponized' nuclear weapon (one that could be effectively placed on a missile).  The experts pointed to the certain unique aspects of the missile launches and stated there were too many identical / highly similar marks to Russian state technology.
Surprised??