It would be the deal of the century - but so far it is still a long way off. An agreement between Israel, Saudi Arabia and the United States on the recognition of the Jewish state by the guardian of Islam's holiest sites would be a political earthquake in the region and beyond. Not only could it transform the already existing unofficial cooperation between Israel and Saudi Arabia into a new regional political alliance while also complicating the recent rapprochement between Saudi Arabia and Iran. It might also cement the decades-old alliance between Riyadh and Washington and counter current trends in international geopolitics, particularly the Gulf states' strategic orientation toward China. But while U.S. policymakers are already dreaming of a foreign policy coup, major hurdles to rapprochement remain: Riyadh wants advanced weapons, a civilian nuclear program and security guarantees from the United States. And last but not least, concessions from Israel in the conflict with the Palestinians.