Siberia (fictional)

Siberia, officially the Commonwealth of Siberia, is a Commonwealth Realm located in East Asia, bordering Russia, China, Kazakhstan, and North Korea. Its official languages are English, Russian, and Siberian, with recognized minority languages including Mongolian, Manchu, Siberian Tatar, and Siberian Yupik. Its capital is Bloodywoodstock, and its largest city is New Siberia City.

History
Britain started colonizing Siberia around the same time as what is now Canada, to the resistance of the Russian Empire. They eventually reached an agreement in which Alaska (then part of British North America) would be traded to Russia, in exchange for recognizing British claims to Siberia; Russia saw no use for Alaska, and later sold it to the USA.

In 1921, Mongolia, newly independent from China, attempted to conquer the province of Tuva. In response, British forces invaded Mongolia; what now makes up the provinces of North Mongolia, South Mongolia, and Huiland.

Siberia was attacked by Japan during World War II, but not truly invaded. At the end of the war, the British Commonwealth annexed Manchukuo and small areas of Korea to Siberia, much to the derision of China (ROC at the time) and the USSR.

Trivia

 * In real life, its equivalent is all federal subjects within the Siberian and Far Eastern federal districts of Russia; the entire country of Mongolia; the Inner Mongolia and Ningxia autonomous regions, as well as the provinces of Heilongjiang, Jilin, and Liaoning, within China; and the Sinujiu SAR and special city of Rason within North Korea.
 * Bloodywoodstock and New Siberia City are in the same locations as IRL Vladivostok and Novosibirsk, respectively.
 * Siberia used the pre-1917 orthography for Russian until 1995, due to resistance to adopt anything used by the USSR.