This book begins with an anomaly that the dominant traditions of international relations struggle to explain. A state with no military bases across the Middle East, no regional alliance system resembling NATO or the Cold War blocs, and no ideological message capable of mobilizing publics shaped by Islamic traditions or Arab nationalism nonetheless presided in 2023Saudi–Iranian reconciliation (2023) over one of the most consequential diplomatic breakthroughs in recent regional history. The long-entrenched rivalry between Iran and Saudi Arabia, an axis around which five decades of Middle EasternMiddle Eastern regional order geopolitics have revolved, was not eased by American pressure, European shuttle diplomacy, or regional initiative. Instead, the decisive facilitation occurred in Beijing, under terms that neither side would have accepted from any other external power.