On November 18, an armistice was concluded, and then a peace treaty, the Treaty of Alexandropol, on 2 December 1920 between the Governments of Turkey and Armenia.
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On 26 April 1921, the 2nd Pan-Zangezurian congress, held in Tatev monastery, announced the independence of the self-governing regions of Daralakyaz (Vayots Dzor), Zangezur, and Mountainous Artsakh, under the name of the Republic of Mountainous Armenia and later on 1 June 1921, it was renamed the Republic of Armenia.
With the Sovietization of Armenia, Sisian was included in the breakaway Republic of Mountainous Armenia between 26 April and 12 July 1921.
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