Some countries might survive. If the war takes place on the northern hemisphere, the southern hemisphere might be much less affected.
But most of them are tac nukes, and they don't come with the support hardware needed to deliver them to large areas of the planet.
Reality is that Europe, Russia, the US, the Middle East, India, Pakistan, and parts of the Far East could have a really bad time.
But most of South America and Africa would likely survive with only economic and political damage rather than physical destruction.
See your favourite massive volcano outbreak, or look at the Chernobyl exclusion zone.
(The impact of the disaster at Chernobyl is much smaller in area than a nuclear explosion would be, of course. But life has re-conquered everything there.)
In any case, I largely agree!
Although I expect this strategy will be employed soon
https://medium.com/luminasticity/predicting-the-worst-and-st...