Soviet Entry into the Axis (Britain Thrives)

The Soviet Union entered the Axis in 1940, after the signing of the historic Hitler-Stalin Treaty, was was then, signed after the Molotov-Ribbentrop Pact.

Adolf Hitler was originally planning to invade the Soviet Union, however he changed his mind, seeing that even if he could conquer Russia, he would still have to deal with Siberia. Therefore, Hitler began a publicly and formalized alliance with the Soviet Union, meeting with his Soviet counterpart Joseph Stalin in Poland.

World War II
During the Second World War, the Soviet Union invaded Alaska, wanting to gain a foothold in North America. They were met with British Canadian soldiers, which they soundly defeated. The Alaskan Soviet Socialist Republic was established.

Afterwards, the Germans and Soviets both invaded Finland, dividing the territory into a German-controlled western Finland and a Soviet-controlled eastern Finland, as they had done with Poland. The Finnish Defence Forces however, were able to repulse both the German and Soviet invasions.

With the Soviet Union becoming a seemingly-invinsible empire in the east, Joseph Stalin sent many soldiers to help Germany's invasion of France - thinking that he no longer needed forces for defensive purposes.

However with the Empire of Japan wanting to break out of the Axis and outdo the rest of the Axis, Stalin was forced to pull his best troops back into the Soviet Union to help them fight against the Japanese forces. Japan invaded Alaska as well, and was successful at first - establishing the Alaskan Republic (Japanese: アラスカ共和国). However their decision to invade the Soviet Union via Manchuria and Siberia led to their downfall.

While the Japanese troops conquered Manchuria and destroyed the entire Manchurian Front of the Red Army, their invasion collapsed in Siberia, when both the Soviet Red Baron and the German Luftwaffe faced off against the Japanese aerial forces.