Armenie forces eventually secured the region but thair efforts wur in vain whan the Bolsheviks, successfu in the Roushie Ceevil War, pushed deep intae the Caucasus. Syunik wis ane o the last major hauldoots o the DRA whose leaders wur eventually expelled bi incomin Soviet authorities tae Iran. Durin Sovietization, Syunik became pairt o Soviet Armenie, while the twa ither disputit territories, Nakhchivan an Nagorno-Karabakh became pairt o Soviet Azerbaijan. It then became pairt o Armenia unner the Transcaucasie SFSR an pairt o the Armenie SSR in 1936. Unner Soviet rule, Syunik suffered a devastatin yirdquauk in Aprile 1931, leavin 80% o its veelages destroyed. A subsequent yirdquauk hit the region in Mey durin the same year, destroyin 27 o 38 veelages in the Sisian destrict.