It was tough yes and my first answer went wrong.
A little searching reveals that its G-4 Super Galeb of former Yugoslavia.
In fact its fuselage was too much similar to MB-339, although its intakes are different.
One thing we can note that two-seat jet trainers are abundant and many countries have their own jet trainers although they dont have high performance jet fighters.
Soko G-4 Galeb is correct!