Up until we kept shit talking and sanctioning China and stirring the Taiwan pot Chinas gov actually CO-OPERATED with us to crack down on fent going missing from shipments.

It's worth noting that we IMPORT it as a medical chemical and pharma chemical and a huge majority of illicit fent comes from it being stolen in transit or logistics "missing" some etc. As a result there was co-operation on both sides of the trade to try and stop as much as possible making it onto the streets, but we nuked that by constantly antagonizing the PRC until they withdrew co-operation on multiple (not just drug related) fronts.

Granted the problem started, developed, and was massively happening long before they stopped co-operating but it's only going to get worse because of our desire to bully and boss everyone around on every corner of the globe.