We don’t need to occupy Iran. We don’t need to send anyone there. We can turn every city in the country into a puddle of molten glass without denting our nuclear arsenal. China and Russia will accept it as a fait accompli because if they make trouble over it we still have plenty of nukes and creepy as Putin is neither country is run by madmen. We will probably lose the nuclear reduction treaties but they really only gave the appearance of increasing safety. A war between us and Russia would still exterminate humanity even with current arsenals.