Union of National Socialist Republics (Fidem Pacis)

The Union of National Socialist Republics (UNSR; Lithuanian: Sąjunga Nacionalinė Socialistinių Respublikų) was a multinational union of republics in eastern Europe that existed between 1928 and 1964. Its members included many former states of the Lithuanian-Polish-Russian Commonwealth who, bound by a shared history and past glories, desired to reunite despite the Commonwealth's forcible dissolution at the hands of the victorious Allies of the Second World War.

In 1908 the Commonwealth had been divided into several independent states under liberal Allied-sponsored governments. As these governments appeared to be favouring the cause of the West rather than that of their own countries, the people soon became disillusioned and became nostalgic for the old days. Between 1916 and 1925 several of these countries came under the rule of nationalist parties, whether by revolution or by election, and began to resume close ties with their neighbours.

A series of brutal civil wars broke out between supporters of the Liberal and Nationalist movements. Although the former Allies supported the Liberals diplomatically, they were too complacent to get directly involved in the war. By 1928 the Nationalists were victorious throughout much of the former Commonwealth, and in December of that year the leaders of several republics gathered in Vilnius to sign the Treaty of National Union.

The new UNSR expanded aggressively, forcibly incorporating several other republics who had refused to sign the treaty. For most of this period the Allies pursued a policy of appeasement, not wishing to get involved in another war. However, the final straw came in 1939 when the UNSR invaded Finland. Albion and Saxony declared war three days later, and the Third World War had begin.