While the RSAF does have an impressive selection of airplanes, from the F-16 and F-15, to the KC
-135 and C-130, to the G-550 CAEW (I believe the E-2C Hawkeyes are now 'retired' and about to be sold), and even the F-5, they are still a small Air Force. They 'only' have about 140-150 airplanes, abide very capable airplanes.
By comparison the JASDF has more than 800 aircraft, the ROKAF has more than 500 airplanes, The RAAF has about 300 airplanes. The Vietnam People's Air Force has a strenght of some 550 airplanes, although it is not able to project its strenght very far beyond its boaders. The PLAAF has more than 2500 aircraft, while the ROCAF has about 400 aircraft