Nobody in the world cares about US constitution or opinion of US courts. It is absolutely irrelevant. If American company does business somewhere and breaks local laws, that part of their business can be disrupted or shut down (by blocking traffic, restricting financial transactions to certain entities, blocking shipments), executives may be arrested on arrival, there may be secondary sanctions etc.
This is absolutely common practice happening everywhere. There is a firewall in every country. Think of malware servers that America blocks.
