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Scenario: The USSR collapses into civil war in the late 80s/90s, a democratic pro-western government fights against a soviet loyalist or otherwise anti-western one.

This would be like any other civil war if it wasn't for the fact that it's in Russia. Could the different sides try to nuke each other? Would there be a large scale NATO intervention, or would the west fear nuclear retaliation from the side they are not supporting?
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