Canada

We also had/have former german pilots teaching in China, they gather so much information about the West and their tactics.

This is the best summary I could come up with:

Canada’s top soldier says reports of three former Canadian fighter pilots training students in China are alarming and serve as a testament to “great power competition” taking place today.

“We in uniform have been entrusted with sensitive and coveted skills and information, and we must remain vigilant and unwavering in our commitment to safeguarding our nation’s interests, both while we serve and after we retire,” Gen. Eyre said.

The issue of Western military pilots instructing Chinese students arose last fall after media reports that as many as 30 former British top guns were working as instructors.

In June, the U.S. government targeted TFASA by imposing export controls on it and other companies for allegedly “providing training to Chinese military pilots using Western and NATO sources.” This activity “is contrary to U.S. national security and foreign policy interests,” the U.S. Department of Commerce said at the time.

Mr. Lawson said the government should take seriously that China is actively seeking out highly qualified fighter pilots in the West to help give the People’s Liberation Army an edge over Canada and its allies.

Mr. Lawson said Ottawa should consider changing post-employment rules for military personnel to prohibit them from taking their specialized skills to work for countries such as China, Russia and Iran.

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M.I. does the dying, Fleet just does the flying.