The Cold War of OTL was a dangerous time that saw a lot of proxy wars between the United States, the beacon of Democracy and Capitalism, and the USSR, the Hegemon of Communism. It wouldn't be until the 1980s that the US finally won the Cold War in effect with the USSR and the Warsaw pact collapsing in on itself due to economic stagnation/depression, military failure, government reforms, etc, etc, but that led to a bunch of things that made the situation worse in both Russia and China. So the challenge here is, with a PoD between when Stalin died as the earliest and Kruschev being ousted from the leadership as the latest, find a way for the PRC, USSR, and maybe DPRK, North Vietnam, Warsaw Pact Nations, and maybe Cuba democratize and transition away from Communism into a mixed system by the 70s, ending the Cold War a decade or two early.