While working on how WWIII will develop in my TL while basing it off of Able Archer, I have been pondering about the possibility of a nuclear exchange upon NATO countries followed up by an invasion by the Warsaw Pact (similar to a certain situation in Giobastia's Able Archer TL). And before you bring up the Threads/Protect and Survive type responses, the type of exchange I have in mind is a limited one in scope (admittedly because doing a typical close to full-scale one would kill the story of my TL so...).
Anyway, the nuclear aspects go like this; the Soviet leadership is convinced that Regean and company intend to attack them through a "ruse" of sorts and decide to settle the whole thing with a couple nukes upon key NATO cities and positions followed up by mostly conventional attacks upon the non-nuked areas. And of course this will bring up the NATO counterattack nuclear wise upon WarPac areas, provided if some nuclear silos aren't affected in the process. Then hell breaks lose, and you get the picture.
So is this doable or is there more that needs to be adjusted to make this plausible?