"Ukraine does not recognize the so-called "constitutional referendum" that took place on Feb. 20, 2017 in the territory of Nagorno-Karabakh of the Republic of Azerbaijan and considers it illegitimate," she said.
Betsa says the the "referendum" violates the Constitution of the Republic of Azerbaijan and international law and has no legal effect.
"Ukraine's position regarding the Nagorno-Karabakh conflict remains unchanged and flags an unconditional support for the sovereignty and territorial integrity of the Republic of Azerbaijan within its internationally recognized borders," the statement reads.
On Feb. 20, a "constitutional referendum" on the redistribution of powers was held in Nagorno-Karabakh. The separatist region's de facto Central Election Commission said on Feb. 21 that 87.6 percent of voters supported changing its form of governance from semipresidential to fully presidential.
Armenia-backed separatists seized control of mainly Armenian-populated Nagorno-Karabakh during a war in the early 1990s that killed some 30,000 people. Diplomatic efforts to settle the conflict have brought little progress.
Baku sees Armenia as the region's occupier.