He served as Chief of the General Staff of Albanian People's Army, the last Minister of Defence of the communist era in Albania, and was a member of the Politburo.

Mustaqi was born in Peçë, a village of the Sarandë District (today's Finiq municipality).

[3] In 1974, Mustaqi was selected for the first time as a representative in the People's Assembly as part of the eighth legislative term until the 12th legislature in 1992.

Co-defendants were the commander Arsen Stroka, and the former political commissar of the Military Academy Ksenofon Coni.

Allegedly, the defendants were responsible having commanded on 20 February 1991 the students of the Military Academy an intervention against the crackdown on riots that spread after the fall of the statue of Enver Hoxha.