As late as this past winter, the ROCAF was still sending its people to Florida to get trained on the E-2 hawkeyes. What kind of info on the internal electronics do you think the Taiwanese have that they have so easily already passed to the mainlanders that could've ended up on KJ-500 project? some of these ideas just completely don't work with logical timeline.
This happened about 2 weeks ago.
Not that I don't believe you, since cross-strait espionage is a given, but I would like to see the source from which you have gathered your information.
I couldn't find a credible English source, which is ironice since it was the US who alerted ROCAF about this. Anyway here is the source in Chinese:
Basically a ROCAF Major was the ringer leader but there could've been as many as 20 people involved in this. The information they attempted to sell was of the upcoming E-2K type which ROCAF have yet to receive but are training for. But they may have successfully sold info on the older C/B/T types. The Link-16 system seemd to be what they Chinese were interested in the most.
Edit: ROCAF already has the E-2K in inventory but was receiving training in the US to qualify new operators.