Not always. Yakovlev & Tupolev were building fighters (or at least, interceptors) until the 1960s. Yakovlev built tactical strike aircraft in the same time frame, & recce & EW versions remained in service until the 1980s, IIRC.1 question regarding the yakovlev entry, is russia gonna take up a fighter project by Yakovlev seriously considering they have always been built by SUkhoi n Mikoyan? ....