Interesting to think of a time when a minor power could produce a fighter that could keep up with "the big boys." Nowadays, fighters have become such expensive, complex beasts, that only the major powers can develop them single handed.
Romania (via Industria Aeronautica Romana, or IAR) kept building aircraft (both fixed wing and rotary wing) through the Cold War, including licensed production, improvements of other manufacturers' aircraft designs, and some of their own indigenous designs as well.