Lithuanian–Byelorussian Soviet Socialist Republic

The Lithuanian–Byelorussian Soviet Socialist Republic or simply Litbel was a Soviet socialist republic that existed within the territories of modern Belarus and eastern Lithuania for approximately five months during 1919. It was created after the merger of the Lithuanian Soviet Socialist Republic and the Socialist Soviet Republic of Byelorussia. The republic was dissolved after the Polish Army took over its claimed territory during the Polish–Soviet War.

After the end of World War I in November 1918, Soviet Russia began a westward offensive following the retreating German Army. It attempted to spread the global proletarian revolution and sought to establish Soviet republics in Eastern Europe. By the end of December 1918, Bolshevik forces reached Lithuania. The Bolsheviks saw the Baltic states as a barrier or a bridge into Western Europe, where they could join the German and the Hungarian Revolutions.

Wikipedia