 The UTVA-66 and UTVA-75 were the first aircraft types to be introduced into the Macedonian Air Warfare and Air Defence Forces.Upon its creation, the Macedonian Air Warfare and Air Defence Forces operated one UTVA-66 and four UTVA-75 A21 two-seat trainers, all leased from the Makedonski Vozduhoploven Sojuz (Macedonian Aeronautical Union).After full-scale conflict began in 1991 in the newly independent republics of Croatia and Bosnia and Herzegovina, the United Nations Security Council unanimously adopted a resolution, requesting an immediate UN arms embargo on Bosnia-Herzegovina, Croatia, the Federal Republic of Yugoslavia, Macedonia and Slovenia.