With the nukes, he can set off a demo on a ship at sea, or anywhere else. After the demo, world shipping trade will cease from the fear of a ship secreted Islamic nukes, or only continue on their terms.
Control of the oil needs no elaboration.
Given his history he will not set off a nuke on a ship at sea. He would most assuredly pick a target that would do much more harm to his enemies.
Stay well - Stay safe - Stay armed - Yorktown