We immediatly go to the highest "DefCon". We seal off bases and arm our missles. We deploy the B-52s. We CAP Washington and the Pentagon is put on full "balloon has gone up" alert. All attack nuclear subs go to their target points with lauch codes. The President of the United States will be given the "football" armed and ready to broadcast launch codes, and he will have his finger on it. At that point all of our enemys will know this, if they want to take the chance, they'll have to decide then. If they decide to go with launch, we'll detect it and put mushrooms all over their front lawn, but we'll have enough in reserve to level anybody else who would take advantage of the situation. If it was China that launched against us, it is likely that we would have enough anti-missle, missles to bring down more than half of their 1st strike (they probably don't have a second strike scenerio due to a lack of warheads and vehicles. This is why I don't think that they would launch in the first place). This means we would suffer some "hits" on the west coast. Russia would stay out of this, because they could not benefit from the outcome. Any incoming warheads from anywhere would get a full retaliatory response, and then a second hit, just to make sure.
Rumsfeld is going to deliver this news to both of those hot heads. Let's just see how they deal with it.
Don't get me wrong, I deplore what could happen if this comes down. But, this just might settle the whole problem down. 25 to 30 million dead just might wake some Islamic Jihad a$$es up.
Must be really choice real estate!