China and Thailand are pretty well-aligned, but policing should be a domestic issue. I wouldn’t want US police operating in Canada (although, legally, the US CBP can operate 100 miles from every land border and every Canadian airport with US preclearance, which I’m fairly sure covers like 80% of the population anywayl.

Probably needed to help fight the scourge of German sand burrowers.

Ireland deploys police to Eurodisney France during tourist season too.