to clarified some points in this TL
the USSR got 1962 had handfull of ICBM SLBM and Bomber, from only a small fraction will reach the USA and hit it.
most part will be used on Central Europe Hitting NATO installation, Nation military bases mostly with Tactical nukes
under "Single Integrated Operational Plan" the USA would have wipe out the USSR from face of the Earth:
alone on Moscow they would drop 100 MEGATONS of all kind of nukes. every major target had to be hit minimum three times
The Fallout from US nukes on USSR and East Europe and soviet nukes launch to west Europe, the wind will push radioactivity to the east.
cover the high populate west part of USSR under a deathly shroud.
the SIOP-63 envision several wave of attack on enemy on East block, USSR, and China.
If those could strike back, then a second maybe a third attack wave would launch using total 2/3 of US stockpile (2130 warheads), the last 1/3 would be used as "strategic reserve"
there will be Climate change do nuclear war, some like federalist believe it gonna be like Volcanic Winter like "year without a summer"
while other like me believe the will be short and brutal reduction of temperature describe in Nuclear winter studies.
both scenarios the survivors will face famine and deadly sickness by radiation or disease (even Bioweapon use )
in the end there will around 10 million soviet survivors but scattered allover the vast now empty land of USSR.
at first USA would look like the winner, on second look it face total social collapse !
Chaos, anarchy, Panik in States while the Officials hiding in there bunkers. economy collapse because no trade or import of oil.
the leaders would send the national guards & army in for restore law and order, but would they follow orders in time like these ?
the situation in Europe will be fare worst, by the use of hundreds of even thousand small tactical nukes at long the both Germanys benelux and North France
Paris will be wipe from face of earth by soviet nukes, to get the NATO HQ who was center in Paris during cuban missile war
here Nation like Germany or France are complete destroy, no-mans lands were Chaos and anarchy rules.
the Rest of World would transform into "African Third World countries", because the breakdown of world trade or Oil import.
they try to keep the remaining infrastructure or hardware running by repairing them over and over again, because unable to get new ones.
it will take decades until civilization recover...