Threats to the Red Sea have shut the kingdom’s workaround DUBAI—Saudi Arabia spent months rerouting oil across the desert to circumvent the Strait of Hormuz. Now, with its Red Sea bypass route disrupted by attacks, the world’s oil kingpin is having to return to the waterway it was trying to avoid in the first place.Saudi Aramco, the country’s state-controlled oil giant, is loading more oil onto tankers in the Persian Gulf and then taking its chances sending them through the Strait of Hormuz. The company has told several of its customers in Asia—its most important oil market—to pick up shipments...