Christ, I stepped into your minefield, thanks for your...
excessive... politeness though.
And not to forget, how outrageous would that be if Chinese military fans found out their advanced stuffs are developed by foreigners, even with Chinese citizenship only. This is both nationalistically and politically unacceptable for millitary branches, and possibly civilian sectors. The government's openness for foreigners to enter Chinese R&D does not prove they're trustworthy until they understand the benefits outweight the concern, maybe a decade later.
The best examples would be the Ukrainians' aids for Chinese aircraft carriers, heavy cargo aircrafts and attack helicopters. I don't hear any foreigners are dual-citizenship (with other western countries) or a Chinese descendent involved with those, and at that time China can't make anything better by themselves yet.
Or put it in rather dark perspective: Americans
does helping China with military projects, passively and without consent. That news about F-35 down below is the prime example, giving it to the adversaries will defeat the purpose of what F-35 are made for:
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Senates want to stop the F-35 deal to Turkey, but they can still have two of them 'for training' until a proper handover in 2019:
https://www.cnbc.com/2018/06/21/turkey- ... kheed.html
EDIT: Nope, not handed over.
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And it gets better after the
Sea Dragon leak: US Boston arrested Qin for smuggling submarine warfare devices to China:
https://www.justice.gov/usao-ma/pr/chin ... -submarine