It depends. When students arrive in Canada.... It depends on where they get their funding. If they are CSC-sponsored, then I would say the risk is higher.
It depends on the topic they're working on. For example, I sometimes do take students from China. I have an array of projects that I can choose from. I can carefully assign a topic to different types of students. This is what I'm doing. For other professors, I'm not sure. When they have CSC-sponsored students, some of those students work like regular graduate students from Canada. I don't see the difference between them.