You do what the the US is doing right now to starve Cuba & end civilization there: you embargo/sanction anyone doing business there.

Like the Treasury/Dept of Commerce & others did with North Korean backed Tornado Cash. Some very quickly retrieved/not well researched (caveat reader) search links; https://home.treasury.gov/news/press-releases/jy0916 https://www.paulhastings.com/insights/crypto-policy-tracker/...