Canada

Fadden said China doesn't respect its own rhetoric on international scientific cooperation.

"There's another principle involved here. In international relations it's called reciprocity — that if we allow them to do x, they should allow us to do x," he said.

"If you look into what the Chinese allow, I think you'll find that very few westerners are allowed to study at Chinese universities looking into those 10 or 15 categories I'm looking at."

This pretty much sums up all the reasons. Don't get me wrong, China have some of the brightest scientist and researcher in the world, simply because distribution is a thing. It's much easier to get real talented people in pretty much any thing given huge enough population and if you direct your resource properly. You can say that their reliance on those odd approach might have killed their own innovation, cause talented people are still people, they can give up or trying to survive in their own way when the env do not give their best support and chance to shine.

Why not just charge a head tax? Wouldn't want the dastardly Chinese "improving their public health system", would we

China stole Canadian research and tech multiple times, the last straw being the COVID vaccine that was supposed to be a joint research venture. It's no wonder Canada has reluctance to allow sensitive tech to be researched by Chinese students.

This is the best summary I could come up with:

In a decision that could have ripple effects on universities across the country, a Federal Court judge has denied a Chinese resident permission to enter Canada, arguing the engineering student could be pressured by Beijing into spying.

The case centres on Yuekang Li's visa application to study at the University of Waterloo and take his knowledge back to China to improve its public health system.

According to the decision, first reported on by the Globe and Mail, Li applied for a study permit in 2022 after the University of Waterloo accepted the PhD candidate into its mechanical and mechatronics engineering program.

Just last month, the spy agency's director David Vigneault warned in a speech that no one should underestimate China's efforts to steal Canadian research and meddle in its affairs.

Fadden, a former CSIS director, said it's past time to consider sealing off some areas of study from foreign adversaries,  including nuclear technologies, high-level optics and space research.

CSIS has long argued that its enabling law needs to be revised so it can better warn other institutions, including universities, businesses and Indigenous governments, of national security threats.

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