The Saudi Arabia-US partnership is a defining pillar of Middle Eastern geopolitics. However, increasing Saudi-Iranian hostility, recent changes inside the Saudi regime, and lingering questions over the consistency of the Trump administration’s support have led Riyadh to diversify its bilateral relationships. King Salman bin Abdulaziz’s historic four-day visit to Moscow in early October must be seen in this context. The Saudi-Russian rapprochement will likely have huge strategic and economic consequences for Middle Eastern geopolitics.