Meanwhile disputes between Abkhaz and Georgian officials continued, however these were rendered moot when in 1920 Russia's Red Army invaded Georgia in 1921. Abkhazia was designated as the Socialist Soviet Republic of Abkhazia, on the proviso that it would later join the Georgian Soviet Socialist Republic under a 'special union treaty'. Russia initially restored the 1864 border along the Begepsta, however this was reversed in 1929 and the Psou border restored. Georgia was later incorporated along with Armenia and Azerbaijan in the Transcaucasian SFSR within the USSR. The Georgian SSR was reconstituted in 1936, incorporating Abkhazia as the (downgraded) Abkhaz Autonomous Soviet Socialist Republic.