In 1921, the Red Army invaded the Democratic Republic of Georgia from Russia, and a Bolshevik regime was installed in Tbilisi. Between 1922 and 1936, Tbilisi was the seat of the Transcaucasian SFSR, which regrouped the three Caucasian republics. After its dissolution, Tbilisi remained the capital city of the Georgian Soviet Socialist Republic until 1991. In 1936, the official Russian name of the city was changed from "Tiflis" to Tbilisi, which led to a progressive change of name for the city in most foreign languages.