One correction to John Ford: in 1981 the US had a noticable advantage at sea. The location of Soviet naval bases allowed NATO, specifically the US, to know the coming and goings of the Soviet navy, including submarines. It was not unheard of for a Soviet sub to go out on patrol and be followed by a US attack submarine for its entire patrol without ever knowing it. Under Reagan this would become more and more common.
NATO weapons were generally a little better than their Soviet counterparts, but the Soviets had lots and lots more of them.
The only reasonable NATO wins sceanrios involved trading land for time while the US, UK and Canada built up forces in Spain and possibly Italy. When the Soviets reached the natural borders of the Alps and Pyrannes NATO would counterattack, with a possible US landing near Valdivostok to put the Soviets in a two front war.
The Third World War scenarios are interesting, but the truth is that the conventional warfare would have been impossible in the conditions of Cold War. Fighting would have been ended shortly by cease fire or more likely by nuclear attacks.
But as I said scenarios are fun so....
I don't believe that the USA landing operation in Russian Far East would have been effective, especially because North Korea would have joined in the war. Also USA would have needed a lot of troops in Cuba. Other inevitable minor battlefields would have been Vietnam and South China Sea (over 20 000 Soviet troops there) Angola (50 000 Cubans) Yemen (Soviet troops and bases) A big question marks are radical Arab states like Syria and Libya. In 1981 Iraq was in war against Iran that I don't think that they would have interfered.
Finland would have been occupied by Soviets in two weeks. Our military was insignificant during the Cold War years.
It was estimated there was a 25% or so chance that China would join the war, and, if they did, a 90% chance they attacked the Soviet Union.
The US plan for Cuba was to kill Castro and let chaos ensue. Castro, like many dictators, did not set up any plns for his demise. The military would likely begin fighting to replace him. At least, that was the US hope.
The Middle East would have broken into a series of confused and chaotic wars. The Saudis and Kuwait would be on the US side, theo ther arab states would likely try anothe rstupid move on Israel hoping for either Soviet backing or for Israel to someho falter this time. Soviet troops in Yemen woudl find themselves in an untenable position really. Long way from home, no chance of resupply and an unreliable population.
Vietnam was at this point, I believe, beginning the reforms that would begin the moderniztion. Not sure how they would play out. Even if they did side with the Soviets, what could they contribute? The best they could do is open a second front if China got involved.
I would bet against a Soviet move on Finland. All it would do is eat up troops without any benefit.
All of the second fronts can be safely ignored while the big battle plays out with the possible exception of Korea. At this point though the RoK was a credible and ready force. While the south would suffer terribly in a war, they would not do nearly so poorly as they did in the first war. The US landing on the Soviet east was dependenant on the situation in Korea. If the troops were needed their to stabilize the front, they would go there. Otherwise they land in Russia.
One thing everyone agreed on was that the war would not alst more than a year under any but the most strange circumstances. The US goes nuclear if they get pushed out of Europe, the Soviets do if they get pushed past the Eastern European satellites.