The Treaty of Kars (, ) was a friendship treaty signed in Kars on October 13, 1921 and ratified in Yerevan on September 11, 1922. Signatories included representatives from the Grand National Assembly of Turkey, which in 1923 would declare the Republic of Turkey, and also from the future Soviet Armenia, Soviet Azerbaijan, and Soviet Georgia, all of which formed part of the Soviet Union after the December 1922 Union Treaty with the participation of Bolshevist Russia. It was a successor treaty to the earlier Treaty of Moscow of March 1921 and the Treaty of Brest-Litovsk marking Russia's exit from World War I, and established contemporary borders between Turkey and the South Caucasus states. It helped to conclude the Battle of Sardarabad and the Caucasus Campaign as a whole.