Consider fentanyl to be a weapon against the West, which China has no intention of curtailing.

If people are to stop dying, they MUST find a way to not use it. Get off fentanyl or die. Get off fentanyl and find a way to live, and take the pain of life.

Perhaps Magnitsky style sanctions on companies and executives producing fentanyl would be effective in reducing supply, but demand is the ultimate problem.