I'll be generous with you and assume that the circumscribed triangle in play is indeed indicative of a three antenna arrangement and that Russia as you claim "does not use" such systems.
You dont make 3 black dielectric section just to use arrangement in A-50. A person with working common sense can see the differences between 2 antenna Russian A-50 with Indian A-50EI or Chinese KJ-2000.
Now tell me: does the Russian military employ every system that is available for export?
You name it you can be sure it is more or less operational. Especially customer will usually prefer things that are in service.
-T-90 ? They use it
-Su-57 ? In service
-Kalibr ? In service
-S-300/400 ? In service
-Su-35 ? Obviously in service
-Kilo boat ? In service
-Iskander ? Of course Russians using it and they are available for export
No one really use "exclusive system" not used by Russian armed forces themselves in some point. Even if you want to include Su-30MKI.. well Russians use them too now as Su-30SM.
Moreover, "Russian assistance" (which is the exact verbiage from my post) does not necessarily translate to the employment or transfer of a complete system or even subsystem. The Russians may have simply provided technical advice that expedited the completion of an extant DPRK program.
Chinese have way more experience and expertise with the design tho. You like it or not, especially the AESA's.
Not going to go back and forth with you, so please keep the nonsense to yourself.
Oops i guess i popped some bubble.