AHC: Reverse Cold War

How do you get a liberal democratic Russia to compete with a communist America for geopolitical dominance? I don't intend for this Reversed Cold War to be a total flip flop of the OTL one like that Mushroom Clouds TL, this Reversed Cold War could start and end at any time you want (I understand that it will be implausible for such a Cold War to start at the late 40s and end at the early 90s).
 
How do you get a liberal democratic Russia to compete with a communist America for geopolitical dominance? I don't intend for this Reversed Cold War to be a total flip flop of the OTL one like that Mushroom Clouds TL, this Reversed Cold War could start and end at any time you want (I understand that it will be implausible for such a Cold War to start at the late 40s and end at the early 90s).

Kube-McDowell's "Alternities" has this universe. Taft becomes President in 1952, the Soviets liberalize.
 
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