Sure, but that's devoid of the international enforcement mentioned. If your assets are in North Korea or a Swiss bank, then they can't force you to pay it. If your assets are in US accounts, then they could easily do so. I imagine there are other countries that we do have treaties with (or even if the bank has branches/business in the US so that the government doesn't make their life difficult) that would cooperate in freezing your international assets held in those countries too.