Perhaps a fuel-Air Bomb over Kharg Island. (Just kidding!)
Kidding ???? Why not? FAE beats the heck out of anything short of nukes. Makes Napalm look like a kitchen match.
Kharg is covered with nothing but oil storage tanks. But, if obama placed as many sanctions on Iran as he has placed on T-H-I-S country, those tanks would be dry in 45 days.