Personally, I'd advocate everyone in USA/Europe etc stay well out of any such fight between Saudi and Iran. It'd probably escalate to include much of the middle eastern world, and I'd just advocate we stand back and let them have at it until they come to a standstill. It might clear the air, it might rid us of a lot of terrorist trouble and when all's said and done - its none of our business. After it ends I'd say there should be a general agreement to refuse to replace the armaments of whoever is still standing. Remember we in Britain get virtually no oil from the middle east - our oil primarily comes from Norway and Nigeria as well as significant amounts from other non-middle eastern countries - so we would have no interest in the oil outcome.