With the United States and Iran engaging in their first round of nuclear talks since coming to direct blows over the summer, Saudi Arabia occupies an influential position on the course of discussions that may be the difference between diplomacy and conflict in the Middle East. Much attention has been focused on fellow regional players Egypt, Qatar and Turkey, each of which is working to support negotiations in the latest U.S. attempt to forge an agreement regarding Iran's nuclear program—and potentially other issues—after President Donald Trump abandoned the last deal during his first administration in 2018. Iran has since ramped up uranium enrichment and other activities, drawing regional concern despite the Islamic Republic's consistent vows against the production of weapons of mass destruction...