Nuke War Anyone?

I was thinking, does anyone really realize just how close to nuclear war we are? Try this very plausable scenario on for size.

* Russia shoots down an American C-17 Cargo plane carrying humanitarian supplies to Georgia
* Russia blockaids more Georgian ports.
* America tries to send in more aid.
* Either a Russian fighter or a Russian naval vessel fires on an American vessel. There is return fire and the Russian vessel is destroyed.
* A Blackjack bomber test American air defenses, and due to the present crisis, is shot down
* Scattered skirmishes between Russian and American forces through out the world.
* KAAABOOOOM!

I hope cool heads prevail here.