These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Gorbachev was overthrown in a coup, killed and/or exiled by "Old USSR hardliners" in a replay of Red October. The "hardliners" to rebuild the Soviet military machine in about ten days and on the eleventh day launch a surprise attack on Europe.
Ex-Soviet Union "disintegrated" and rogue newly-formed republics attacked NATO/whatever with immense and totally unrealistic assets.
Sometimes the war broke out for no discernible reason ("We are at war for reasons which are not of your concern. Your mission is...")
It could happen that the surprise was SO total that the US had NO assets in the Atlantic, and UK had to go against the Soviets all alone.
If so, USA actually had no assets available for WWIII due to the turmoil caused by the Second Civil War.
NATO/BLUE orders usually started with "FROM THE THEATRE COMMANDER TO TF COMMANDER YYYYYYY".
There were more submarines in the Baltic than in the Atlantic - but all diesel ones.
Red Storm Rising reigned, and if the scenario didn't start with Keflavik already controlled by the Soviets, then NATO had to race to Keflavik before the Soviet got there.
...Meanwhile, US subs where attacking the Kola Peninsula with Tomahawks...
...This, of course, if NATO wasn't "resurging" and sending one to three battlegroups into the Barents Sea.
One scenario out of three had a convoy in it.
Captains escorting UNSPEAKABLY VITAL convoys to what-the-place were actually advised to ignore the "ships running aground" messages.
The USA had good reasons to be nervous about the Northern Front, since Norway used to secede from Europe and join the Soviets/CSI at random times,and for no discernible reason.
Once a week a submarine from either side defected, and had to be hunteddown/protected until the defection was complete.