There was a time when Saudi and American interests in the Middle East seemed so aligned that the cigar-smoking former Saudi ambassador, Prince Bandar bin Sultan, was viewed as one of the most influential diplomats in Washington. Those days are over. The Saudi king and his envoys — like the Israelis — have spent weeks lobbying fruitlessly against the interim nuclear accord with Iran that was reached in Geneva on Sunday. In the end, there was little they could do: The Obama administration saw the nuclear talks in a fundamentally different light from the Saudis, who fear that any letup in the sanctions will come at the cost of a wider and more dangerous Iranian role in the Middle East. Although the Saudis remain close American allies, the nuclear accord is the culmination of a slow mutual disenchantment that began at the end of the Cold War. […]