(Warning: the following story is purely fictional, its a "What if" the Operation Unthinkable planned by Churchill happened, and its based on especulation)

April 30th 1945:

The Nazi Leader, Adolf Hitler, commited suicidal, the Nazi Germany decided to surrender, and WW2 has ended in Europe, but the war continues on Asia, Japan is more and more weak, but they don't want to surrender, so the US threw two atomic bombs to the japanese cities of Hiroshima and Nagasaki, so Japan decides to surrender, and in september 2nd of 1945, WW2 has ended in entire world.

But the British Prime Minister Winston Churchill had a new plan, The Soviet Union helped the western allies against the nazis, but west world doesn't like the communism, and Soviet Union is literally the first communist power in history, so they had a new plan to end the communist power, the "Operation Unthinkable" it consisted on invading the Eastern Europe territories controlled by soviets, and later attacking the Soviet Union on the biggest military operation in history, and ending the Communist Superpower.

Then France didn't wanted a new war, because it was very weak for the WW2 destruction, but the United States were prepared, for the biggest war of Europe.

so in October 21st of 1945, The Allied troops in the border with the Soviet Lands attacked, United States, France and Britain started the attacks against Soviet-Controlled zones of Eastern Europe.

Stalin felt that westerns made a traition against the Soviet Union, after helping against Nazis, so the Soviets had a fast and aggresive response.

We need to remember, in that moment, The Soviet Union controlled the whole Eastern Europe, its resources, population, cities, richness, and turned in the most powerful country on earth. So they initially beated western allied troops.

The Soviet People were inspirated on the Nationalist Communist speechs of Stalin, and were ready to die for a second Great Patriotic War against the west

France, US, and Britain prepapred a second attack, and it was succesful, they occupied the Soviet zone in Germany, Czechslovakia, Slovenia, Hungary, Western Poland, and Bulgaria. Soviet Union made another offensive in Romania, to retake territory.

The main countries in the war were U.S. and Soviet Union, because France and UK were very tired, but the US and USSR were prepared to MORE DESTRUCTION. Stalin forced the soviet scientist to created the first soviet nuclear bombs, and they did it, the first Soviet Nuclear bomber flied from Vladivostok, Russia, to Los Angeles, California, and it threw the Bomb on the american city.

the US discovered that Soviets also had now atomic bombs, so they created more and more bombs, and threw it into Sevastopol, Crimea,

1947 came, the war turned nuclear, Soviet Union was still defending its Eastern European zones, the war had millions of deaths, main West Coast american cities were destroyed and Nuclear, so many Soviet Siberian zones.

in 1950, the world was devastated, the war ended on nothing, millions of deaths to a Status Quo, Earth turned too radioactive, and people of all the countries started to die from cancer and other deceases due to radiation, the Nuclear Winter turned the planet into impossible for life, so many species, included humans, eventually got exctint

THE END.