The U.S.-Iran deal has raised hopes that the oil supply disruption in the Middle East could be nearing its end, but the biggest international tanker operators aren’t rushing to return to the Strait of Hormuz. Oil tanker owners and operators are cautiously optimistic, but they will wait until they see a “material” agreement and safety guarantees before returning to the world’s critical oil and gas chokepoint, Jotaro Tamura, chief executive officer at Mitsui OSK Lines, the world’s largest tanker operator, told the Financial…