As another poster mentioned, I think the most realistic option is one where the USSR* does not get into the Cold War. It's why I put my 'death of Stalin' in 1945; with his removal, there will be some 2-3 years where the domestic Soviet political squabbles make foreign 'adventures' [such as Berlin Blockade] very unlikely. At the same time, almost none of the larger players desire adventures either. This means that by the time the power-structure has found a 'new normal' [I suspect very similar to RL; First Secretary Khrushchev at the head of a troika with say, Voroshilov as Premier] the 'East-West' tension may have not gotten so severe.
That in this scenario, the world only gets into a 'Cold War Lite'; a time of friction and competition but not annihilation. Orthodox Marxism-Leninism holds a belief called 'historical determinism' - that in this case that worldwide Communism is the future of mankind. That while the capitalist states can stall this progression, they cannot stop it; it's inevitable. That's the gist of Khrushchev's 'we will bury you!' line; that the East will bury the West in the same manner the automobile replaced the horse and buggy. The man himself when touting 'peaceful coexistance' merely meant 'we won't use T-34s to bring others socialism' - there's no need to [in their minds] for capitalism will fall apart sooner or later, torn apart by it's own proletariat and inbuilt contradictions. But back to the possible future...
Without the runaway military competition with the Western Powers, the USSR is able to devote more resouces to plowshares than swords. Without the final years of 'High Stalinism', warping the internal intellectual life with paranoia and waves of terror, the more technically-savvy economists, engineers and managers are able to come up with better Five-Year Plans which don't rely on simple 'more of everything' and brute force. And with 'the Organs' with clipped wings and Beria's ashes blowing in the wind, the Soviet Union can make use of all those tens, perhaps hundreds of thousands of highly qualified and intelligent minds to do more productive work for The People than hewing logs in Siberia. Lastly, without Stalin's ego demanding complete idological uniformity even on other nations; there is some 'leeway' for other Socialist nations to experiment a little, allowing the USSR to later on [if so desired] to adopt some of the more successful projects.
* That's the point. Not Russian Federation, not Russian Empire.