The Saudis had barely started pumping their oil when World War II broke out and the strategic significance of oil soared even higher. During that war, U. S. president Franklin Delano Roosevelt met with Ibn Saud, and the two men reached an understanding to which both sides have adhered faithfully ever since, even though it is not enshrined in any formal public treaty. The deal ensures the U.S. unfettered access to Saudi oil; in exchange, the Saudi royal family gets as much U.S. military equipment and technology as it needs to stay in power against all comers.