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I had a discussion about this topic lately, and I asked myself: How realistic is a Soviet Cold War victory with the earliest POD just before the Soviet crushing of the Prague Spring (it should be some kind of mirror to OTLs USA victory, with Europe going red and pro-soviet, and some states leaving a now socialist US)?
If this seems to far fletched for you, then take a POD in 1964, before Kruchchev was deposed (but this gives a few minus points )