The Treaty of Kars is ratified in Yerevan, Armenia.
The Treaty of Kars (Turkish: Kars Antlaşması, Russian: Карсский договор, tr. Karskii dogovor, Georgian: ყარსის ხელშეკრულება, Armenian: Կարսի պայմանագիր, Azerbaijani: Qars müqaviləsi) was a treaty that established the borders between Turkey and the three Transcaucasian republics of the Soviet Union, which are now the independent republics of Armenia, Georgia and Azerbaijan. The treaty was signed in the city of Kars on 13 October 1921.Signatories of the Treaty of Kars included representatives from the Grand National Assembly of Turkey, which would declare the Republic of Turkey in 1923, and from the Armenian, Azerbaijani and Georgian Socialist Soviet Republics with the participation of the Russian Soviet Federative Socialist Republic. The last four parties would become constituent parts of the Soviet Union after the victory of the Bolsheviks in the Russian Civil War and the December 1922 Union Treaty.The treaty was the successor treaty to the March 1921 Treaty of Moscow. Most of the territories ceded to Turkey in the treaty were acquired by Imperial Russia from the Ottoman Empire during the Russo-Turkish War of 1877–1878. The only exception was the Surmali region, which had been part of the Erivan Khanate of Iran before it was annexed by Russia in the Treaty of Turkmenchay after the Russo-Persian War of 1826–28.