I think this is an "ought VS is" thing - I know realistically the US could just hit people until they agree, but this is something that would need to be handled by an international governing body. If someone in NY scams someone in CA, CA can't just unilaterally prosecute them, it becomes a federal crime because it's across state lines. Similarly this is between countries and I don't know if we even have international laws for stuff like this, so it may not even be truly illegal. The US could request extradition but I think that's the extent of the legal actions the government could take.