 Complete the following phrase:  The Nagorno-Karabakh conflict is an ethnic and territorial conflict between Armenia and Azerbaijan over the disputed region of Nagorno-Karabakh, inhabited mostly by ethnic Armenians, and seven surrounding districts, inhabited mostly by Azerbaijanis until their expulsion during the First Nagorno-Karabakh War, which are de facto controlled by the self-declared Republic of Artsakh, but are internationally recognized as de jure part of Azerbaijan. The conflict has its origins in the early 20th century, though the present conflict began in 1988, when the Karabakh Armenians demanded that Karabakh be transferred from Soviet Azerbaijan to Soviet Armenia. The conflict escalated into a 