Two Azerbaijani citizens went on trial in the country's breakaway Nagorno-Karabakh region on October 27.
Shahbaz Quliyev, 46, and Dilham Askerov, 54, are charged with murder, espionage, illegal border crossing, and illegal weapons posssession.
Authorities in the self-proclaimed government of Nagorno-Karabakh say they crossed into the breakaway region on July 12 and killed an officer in its military.
Azerbaijani officials say the self-proclaimed government, which is not recognized by any nation, has no legal right to try the men.
Baku and Yerevan have been locked in a conflict over Azerbaijan's breakaway region of Nagorno-Karabakh for years. Armenian-backed separatists seized the mainly Armenian-populated region from Azerbaijan during a war in the early 1990s that killed some 30,000 people and displaced many more.
Diplomatic efforts to settle the conflict have brought little progress.
Based on reporting by aysor.am and Interfax
