why Yugoslavia? Let's see the list of aircraft that flew here from 40'-90' (both in Yugoslavian air force or by other air forces)
P51, BF109K, Spitfire LF Mk IX, F-86, M2000, MI-8, Mig21, Mig29, Gazelle, AV8B, F18C, F16, F14. Had mix of western, domesticly developed and eastern hardware. Diverse terrain, 6th fleet was regular to Adriatic.