You are too optimistic. Of all the component devices, China has only handled GaN as High power amplifier, The japanese is GaN as a high power amplifier, high power switch and drive amplifier.Dr. Das confirmed that they have moved from GaAs to GaN for all airborne radars. Tejas MK1A will have GaAs based Uttam, rest all derivatives for Su-30/MK2/AMCA will be GaN based.
No need to doubt our scientists, IMO.
The US does all the above, plus GaN for low noise amplifiers
As for India, it is a long way off