End the war, get the oil tankers moving, and the world's economy returns to normal. It sounds easy. It really isn't. Donald Trump and the Iranian regime have signed a memorandum of understanding in the hope of bringing the four-month conflict to an end. But the key objective of allowing global shipping to pass freely through the currently Iran-controlled Strait of Hormuz is far less straightforward than it may appear. From the threat of minefields to a change of heart over military action, it could take months - if not longer - for the region to return to normal. Niall Paterson is joined by Sky's military analyst Sean Bell.