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Sparked by this thread:

https://www.alternatehistory.com/discussion/showthread.php?t=252233

So, what if the 2008 Russo-Georgian War had led to a nuclear war between the US and Russia? Say, the US obliterates the Roki Tunnel, killing hundreds of Russian soldiers in the process. Russia retaliates some way, the tit for tat escalates until in late August the nukes fly. And it's not a limited nuclear war, both countries unleash everything they've got.

Presumably the UK and France also get involved and get heavily hit. Likewise, the Eastern European NATO member states get plastered by the Russians. What about elsewhere, like Iraq and Afghanistan, for example. Due to gradual nuclear disarmament in the last 20 years or so it would probably not be as bad as Protect and Survive, but I reckon the death toll would still run in the hundreds of millions.

And yes, this scenario is quite unlikely, I admit, but I'm asking what if it had happened, not how likely it was.
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