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In any TL dealing with a conflict in Europe the reliability of the Warsaw Pact armies would have to come into question.
I'm certain that Romania would not participate as long as Ceausescu is leader.
East Germany would be a willing ally to a point. Same for the Czechs, and Bulgarians.
The Hungarians might be willing to do very limited action such as logistics.
The Poles would be the wild card. It wouldn't be long before resentment and animosity would ultimately limit their willingness to do anything pro Communist.
Assume the TLs are 1978-1986
Assume the TL involves no nukes only Chem.