evidence: The area designated Nagorno-Karabakh had a majority ethnic-Armenian population but was controlled by Azerbaijan. Nagorno-Karabakh's regional parliament voted to become part of Armenia when the Soviet Union began to collapse in the late 1980s. [...] Under the deal, Nagorno-Karabakh remained part of Azerbaijan, but since then it has mostly been governed by a separatist, self-declared republic, run by ethnic Armenians and backed by the Armenian government.