About the Su-35's L-Band AESA, the point is less to do counterstealth by itself than to function as a bistatic system with L-Band AEW&C. Think about it this way, the wingtip L-Band arrays are way too small to be effective counterstealth radar by themselves. However, if you have a AEW&C functioning in the L-Band, the diffracted emissions off a stealth aircraft can be picked up by the L-Band AESA on the wingtips. provided the AEW&C is datalinked to the fighter and the software supports this type of intercept.
That would also tie into claims that the Su-35 in PLAAF service lacks wing AESA; since the PLAAF does not run Russian AEW&C craft and you'd need to reprogram the KJ-500s to support datalinks + wingtip AESA. This would be a difficult task without Russian support, and with Russian support, you'd be leaking details of your AEW&C craft.
That would also tie into claims that the Su-35 in PLAAF service lacks wing AESA; since the PLAAF does not run Russian AEW&C craft and you'd need to reprogram the KJ-500s to support datalinks + wingtip AESA. This would be a difficult task without Russian support, and with Russian support, you'd be leaking details of your AEW&C craft.
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