Comment: The Chinese should strike from the North. The US/ SK should strike from the South. We know where the weapons that threaten Seoul are located, bust tactical nukes over the entire area. Swarm Pyongyang, decapitate the military and government leadership. They have stated their intentions and there is no good reason not to carry out a first strike. Same with Iran. You can minimize innocent casualties by engaging the full and total powers of the US/SK/Chinese Militaries. This could be over in minutes. 

Will the Chinese confirm their membership in civilized society? That is the only question.