As the U.S.-Iran war nears the one-month mark, the fragile global oil market has emerged as a key leverage point for Iran — and some shipping and insurance experts don't expect the situation to return to normal until the war winds down significantly. Since the start of the conflict, Iran has threatened to hit ships that travel without its permission through the Strait of Hormuz, a narrow chokepoint between Iran and the Arabian Peninsula that normally carries around one-fifth of the world's oil.