AHC - Post-WW2 Soviet Collapse and Civil War

In the context of a near-OTL as possible Western-Allied Victory in WW2, the challenge is to have the Soviet Union collapse and descend into civil war after receiving limited to no lend lease during the war.

Bonus points if a post-Soviet regime comes to power that undergoes De-Stalinization / Decommunization though a democracy or (any form of) monarchy is not a requirement.

Nor does an ATL post-WW2 Russia have to be pro-Western, Western-leaning perhaps yet never undergoing full Westernization.
 
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