On the eve of the new Iranian President’s first visit to the United States, the media is full of hopeful stories about a diplomatic ending to the nuclear disagreement. The New York Times reports that President Obama sent Hassan Rouhani a letter promising relief from sanctions if Iran would “cooperate with the international community, keep your commitments and remove ambiguities.” “Iran’s leaders,” the story continues, “have decided to gamble on forging a swift agreement over their nuclear program with the goal of ending crippling sanctions.”Rouhani responded publicly with an op-ed in the Washington Post today: “I urge my counterparts to seize the opportunity presented by Iran’s recent election. I urge them to make the most of the mandate for prudent engagement that my people have given me and to respond genuinely to my government’s efforts to engage in constructive dialogue.”“Under no circumstances would we seek any weapons of mass destruction, including nuclear weapons, nor will we ever,” he told NBC news.Elsewhere the mood is equally upbeat. White House spokesman Jay Carney said Obama may extend a hand to Rouhani when both attend the UN General Assembly next week. Back in Iran, as a sign of goodwill, the government released 11 political prisoners.But not everyone is pleased. “There is no more time to hold negotiations,” an adviser to Israeli Prime Minister Benjamin Netanyahu said. “If the Iranians continue to run, in another half a year they will have bomb capability.” “One must not be fooled by the Iranian president’s fraudulent words,” reads a statement issued by Netanyahu’s office. “The Iranians are spinning in the media so that the centrifuges can keep on spinning.”The Saudis, like the Israelis, are uncomfortable with Washington’s newfound friendliness toward Iran. To them, President Obama seems to be putting America’s relationship with the Kingdom at risk in favor of reaching out to Tehran. As with Egypt and Syria, Washington and Riyadh see Middle Eastern crises through different lenses. The Saudis are good at diplomacy and securing their interests in their neighborhood; if they come to suspect that an American deal with Iran isn’t satisfactory, we might find some pushback from Saudi Arabia on other issues in the Middle East—in Iraq, Egypt, Syria, and elsewhere.