Thank you very much for the question and the kind comments.
On a scale of one to 10, I would presume.... Here again, I would say you have to look at the national issues. The risks of research collaboration with the United States or France are not the same as with China or Russia. I'm not sure that the agnostic approach fully works. I would assign to the case of China probably about an eight, but that does not mean that the door is closed or should be closed; it means care is needed.
I would recommend this excellent report from MIT. It came out in November of last year. They had nine eminent scholars and they took almost 18 months, I think, to write the report. It's available online. There's one line that jumped out at me and it is as follows:
But we believe that the United States has more to lose than gain if broad, sweeping restrictions on academic research are implemented that degrade or dismantle the U.S. system of open science.
This is an organization that, in the same document, talks about classified labs that work for the Department of Defense and that are basically locked to all foreigners. You can walk and chew gum at the same time. You can do essential, useful, meaningful research, collaboration on health and environment with China. You can also try to keep that door tightly locked on sensitive technology.