The Treaty of Riga was signed in Riga, Latvia, on 18 March 1921 between Poland on one side and Soviet Russia and Soviet Ukraine on the other, ending the Polish–Soviet War (1919–1921). The chief negotiators of the peace were Jan Dąbski for the Polish side and Adolph Joffe for the Soviet side.

The Byelorussian Soviet Socialist Republic, also known as Byelorussia, Belorussia, Belarusian SSR, Soviet Belarus, or simply Belarus, was a republic of the Soviet Union (USSR). It existed between 1920 and 1991 as one of fifteen constituent republics of the USSR, with its legislation from 1990 to 1991. The republic was ruled by the Communist Party of Byelorussia and was also referred to as Soviet Byelorussia or Soviet Belarus by some historians. Other names for Byelorussia included White Russia or White Russian Soviet Socialist Republic and Belorussian Soviet Socialist Republic.