 Complete the following phrase:  After the Soviet Union expanded into the South Caucasus, it established the Nagorno-Karabakh Autonomous Oblast NKAO within the Azerbaijan SSR in 1923. In the final years of the Soviet Union, the Armenian Revolutionary Federation established a branch in Nagorno-Karabakh. In January 1991, the Dashnaktsutiun won the parliamentary election and governed as the ruling party during the entirety of the 