That's rather naive, considering China has a international police unit, that is stationed in several countries https://en.wikipedia.org/wiki/Chinese_police_overseas_servic...
https://www.nycpolicefoundation.org/ourwork/advance/countert...
https://www.nyc.gov/site/nypd/bureaus/investigative/intellig...
Compounding the difficulty of the question: half of HN thinks this would be a good idea.
https://en.wikipedia.org/wiki/Extraordinary_rendition
Russia is more known for poisoning people. But of all of them China feels the least threatening if you are not Chinese. If you are Chinese you aren't safe from the Chinese government no matter where you are