A conventional war in Korea would almost certainly kill miliions of South Koreans. Do you really think the ROK will accept that?
A nuke tossed at Korea would kill fewer people than a conventional war, and would give just cause for a nuke response that might end things immediately.
That's rather doubtful.
I would be inclined to think that if we launched a couple nukes over Pyongyang, that the Iranians would straighten up PDQ as well.
Oh puhleeeeze! Why do you think that would work?!? /sarc
what's that?...Japan you say?
"A nuke tossed at Korea would kill fewer people than a conventional war, and would give just cause for a nuke response that might end things immediately."
Do you really think that the Chicoms will stand by, and allow anyone to nuke North Korea, right on their doorstep??!! Please explain to me in detail how you would keep China from tossing everything they have at us in retaliation for a pre-emptive nuclear strike on North Korea.