A very quick scenario I made to rest from finals and warm up to write my other TLs like Pachamama Awakens. Pulled it together on a couple hours from an old abandoned map so don't expect too much.
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Unthinkable:
Basically, Wiston Churchill goes ahead with Operation Unthinkable in 1946.
Things go VERY bad for the Allies. Morale drops below the floor as soldiers are asked to fight yet ANOTHER war, this time against their former allies and with Nazis at their side. The logistic train never reaches far beyond Poland, even with all the resources of the US and the British Empire. Not even the power of the atomic bomb was able to stop the Soviet steamroller (not that the Allies could have consistent air superiority anyways), and the waves of deserting soldiers and uncooperative civilians unwilling to fight another war. In fact, the mere proposal of bombing Paris as the Soviets advanced broke down the US-UK alliance, and soon, the United Nations started their long and painful retreat from Europe.
On the other side of the curtain, an enraged Stalin orders the Red Army to "Not to stop until you plant a red flag over Gibraltar Rock".
Only two years later, his words become reality, as partisans of the Iberian People's Republic take over the besieged British garrison.
It is 1955 today. The USSR is the undisputed master of Europe.
While the Red Army also experienced desertion and mutinies, the unwillingless of the Soviets to bear yet ANOTHER Nazi invasion took them all the way to the Atlantic shores, assisted by communist partisans on the way. Eastern Europe was annexed, with only a note of protest from the United Nations. Germany was also annexed and dismantled; Stalin took a cue from Roosvelt and divided it on several states, but as far as the Soviet Union is concerned, Germany no longer exists or will ever exist again as a nation; instead, education there forces the identity of Bavaria, Saxony, Rhineland, Hannover, Brandenburg..., and most importantly, an absolute hate of Fascism, love for peaceful agrarian living, and a sense of duty to the Soviet Union. Or else. The rest of Europe retains a nominal independence, though it's difficult to say that with Red Army garrisons in every capital. The Soviet Union has imposed taxing reparations from most of its conquered territories, and Stalin has consolidated power to a terrifying degree. Relations with the West are completely frozen; as far as Stalin is (or rather, was) concerned, the United Nations are a fascicapitalist alliance plotting for the fall of the USSR. Soviet citizens are taught so, too. The most brutal decisions have been taken with that mentality.
The United Nations almost dissolved after Unthinkable, and just saying the name "Winston Churchill" provokes bar fights everywhere in the Anglosphere. However, at the end they stayed together out of fear of the Soviet juggernaut. The United States, with the largest remaining army and navy, provide most of its military muscle and economic power. UN protectorates have been established on the former colonies of occupied Europe, and it retains bastions in the Mediterranean, much to the lacking Soviet Navy's frustration. In Asia, the USA has cobbled together a United States of Asia from Japan, South Korea, the Philipines and the Republic of China, which retains Hainan. Something of a phyrric victory, of course, and Soviet propagandists are quick to call it a revived Japanese Empire. The USA has a cold alliance with the UK and France. The UK, of course, dropped the ball so hard that US generals see little reason to help them prop their falling empire, beyond the need of cooperation against a common empire. Free France still clings to the fantasy of returning to the mainland, and while the US is more sympathetic towards them, but they can't ignore the fact that their colonial subjects aren't very willing to being governed from a phantom Paris anymore.
The Third World is quickly becoming independent, no matter what the goverments in exile might want. India and the Middle East aren't very friendly to the United Nations, being members only in principle: India has deep sectarian issues, but sees itself as an emerging power, mobilizing its huge population towards industralization. Poor Turkey is stuck in a situation similar to Finland OTL; too hard for the Soviets to conquer, but basically surrounded by them. Israel and Palestine are still dealing with their painful partition. The US looks towards the conservative governments and dictatorships of Latin America for more "reliable allies", but not all are convinced, and Argentina and Brazil wish to persue armed neutrality. The colonies in Africa and Southeast Asia seem to become the next battleground in this Cold War.
Not that the USSR has it any better. It has created one of the largest empires of history, covering countless nationalities, in just a few short years, and has kept it together by force of arms, repression, and political indoctrination. From uprisings in Iran to tensions in Korea to unruly European allies and of course the big Panda Bear in the room that is China, something is gotta give one of these days...
And just a few hours ago, Stalin was pronounced dead...