Well America, are you going to spread "Freedom and Democracy" there? It sure needs it.
Perhaps you should check history before being sarcastic next time. http://en.wikipedia.org/wiki/Korean_War
And there wouldn't be millions of US losses, we would never put ourselves in that situation. It would be relentless airstrikes aiming at disabling air defenses/artillery positions and decapitation of the regime. The problem would be mass civilian casualties in south korea.
(just a line of reasoning, not my endorsement or something)