During the three years of political upheaval in the Middle East since the "Arab Spring” began, Saudi Arabia has attempted to maintain its dominant status in the region by any means necessary. In 2013, the Saudi royal family searched for regional allies, and sought – as in Egypt – to restore old allies to power. The Kingdom also used its vast oil wealth to bring about the type of regional stability with which they have been familiar for decades.To the relief of the Saudi royals, the Arab Spring did not lead to the creation of functioning democracies in Tunisia, Egypt, Yemen, Bahrain, Libya, or Syria. Better still, from their perspective, the Islamist regimes that emerged proved to be either fundamentally incompetent, and thus easily overthrown (as with President Mohamed Morsi’s government in Egypt), or merely dysfunctional (as in Tunisia), and thus possessing no appeal as a model for other countries.Still, the Arab Spring revolutions did fundamentally undermine the pillars of the old regional system with which the Kingdom was so comfortable. It ousted reliable old allies like Egypt’s Hosni Mubarak and Tunisia’s Zine El Abidine Ben Ali (now hiding out in Riyadh), and turned once-tolerable regimes like Bashar al-Assad’s in Syria into murderous opponents.Saudi Arabia’s initial response to the fracturing of a system that it had underwritten with petrodollars was to increase support for those of its allies that were still standing – Jordan, Lebanon, and Bahrain. Its next move was to underwrite the Egyptian army’s removal of Morsi’s Muslim Brotherhood government in Egypt, thumbing its nose at the United States in the process.As became clear in 2013, Syria is now the main focus of Saudi Arabia’s attention in the region, and for existential reasons. The Saudis consider the struggle between Assad and his opponents a proxy war against their own main adversary, Iran. The Kingdom has been the primary source of financing and weaponry for Sunni Syrian rebel forces fighting Assad’s army, which is backed heavily by Shia Iran and Hezbollah, the Lebanon-based Shia militia.Of course, in their struggle against an Iranian regime that is backed by Russia, the Saudi royals would like continued protection from their main ally, the US. But they no longer feel constrained to wait for US approval of their actions or even to refrain from acting against American preferences. Saudi Arabia is experiencing a fear of abandonment by the US, and it is acting accordingly.Since World War II, the Kingdom has been nurtured by the US – and has relied on it for military and political support since the first oil concession in 1938. Following US President Barack Obama’s refusal to enforce his "red line” concerning the Assad regime’s use of chemical weapons, the Kingdom’s rulers concluded that they were facing a different America from the one that 22 years ago sent a half-million troops to expel Saddam Hussein’s forces from neighboring Kuwait.The question for the Saudi royals now is this: Will the US merely be indifferent to their deepest fears, or will American policy in the region actually aggravate these fears? Iran will be the litmus test for Saudi-US relations in 2014 and beyond.Iran, a US rival in the region ever since the 1979 Islamic Revolution, may be in the early stages of normalizing its relations with America. In fact, this may not prove as difficult as three decades of animus might suggest.As Henry Kissinger has often argued, the US and Iran have strategic interests that are fundamentally in harmony; what is abnormal is the post-1979 estrangement. Indeed, before the Islamic Revolution, Iran formed the bedrock of US policy in the Middle East and South Asia. The Kingdom’s rulers, like all royals, think in the past, remember this history well, and fear its repetition.Of course, the Saudi royals recognize why America wants to reach a deal with Iran. There is no easy military response to Iran’s nuclear program, and no bombing campaign can eliminate the country’s nuclear knowledge. But, though sanctions alone will not stop Iran’s nuclear ambitions, their progressive tightening has severely damaged the regime. Now, instead of applying another turn of the screw – and possibly causing the regime to buckle – Obama is easing the pressure.The issue for the Saudis is not merely Iran’s putative nuclear capability. A deal on Iran’s nuclear program would legitimize the regime’s regional influence in a way that has not occurred in decades, thereby serving its hegemonic objectives. The deeper threat or fear is that Iran’s ultimate target is leadership of Mecca, the cradle of Islam.That is why the Saudi royals prefer to keep Iran chained with international sanctions. Making matters more bewildering is the declining potency of Saudi Arabia’s trump card – oil.Copyright project-syndicate