Your comment reminded me of a thought I had not too long ago: what would stop a superpower like the United States from going around shaking down all the suppose

Your comment reminded me of a thought I had not too long ago: what would stop a superpower like the United States from going around shaking down all the supposed tax havens? They wouldn't have to declare war outright, they could just impose a no-fly zone and put a navy cordon in international waters. In the cases of land-locked tax-havens in Europe, the superpower would need to negotiate with the tax havens of the bordering countries, so it's less feasible, but still possible. Edit: This would be specifically for individuals hiding their wealth abroad and declaring a lower than actual income, and not for corporations that publish their balance sheets.