Soviet invasion of Armenia
The Soviet invasion of Armenia was a military campaign which was carried out by the 11th Army of Soviet Russia from 29 November to 4 December 1920 in order to install a new Soviet government in the First Republic of Armenia, a former territory of the Russian Empire. The invasion coincided with an invasion by Kemalist Turkey and anti-government insurrections organized by local Armenian Bolsheviks.
Source: Wikipedia — Soviet invasion of Armenia (CC BY-SA 4.0)