[quote=So Boerd]
So Russia nukes Berlin, Rome, London, Paris and Madrid, but makes no preparations for a strike on the US. US strike or no?
[/quote]

The UK and France detect incoming nuclear missiles and return fire with their own. M.A.Dness ensues. [s]Also why would anyone nuke Spain lol[/s] Unless somehow Russia is capable of disabling all retaliatory strike capabilities in both France and the UK--part of the [i]beating heart[/i] of the European Union--and manages to slip nuclear devices that require no travel time to hit all important targets in both countries simultaneously without anyone at any point detecting and foiling this plan.

Also, considering at this point Russia will have gone completely insane and declared war on the world, the US would most likely strike back. Then again, this is crazy cucooland where Putin for some reason thinks he can take over all of Europe and not lose, and where the US would not step in to stop a super Soviet Union from forming.

This is why MAD works. Russia has no reason to think it could ever get away with using nukes anywhere important and win, even [i]once[/i], leave alone hitting every capital of every major European country and wiping out every single one of their governments with impunity. Which would imply a far stronger Russia than what presently exists.