Washington has been cheering Beijing's recent initiative to increase its energy imports from the Saudi kingdom and its neighbors. Why? Because the more energy China buys from the peninsula, the less it needs to buy from Tehran. If there is any plan that can stop the ayatollahs' nuclear ambitions short of the use of force, it will include an air-tight energy embargo enforced by sanctions and backed by meaningful punitive measures. And up to now, the biggest sanctions buster has been Beijing.