Two weeks ago, Recep Tayyip Erdogan accused Iran of playing a dangerous game in the region. But today, he was on an official visit to Tehran. Just when the Sunni-Shia divide never seemed greater, could material interests trump sectarian rivalries? If a deal on the Iranian nuclear power means the lifting of sanctions against Tehran, could Turkey win big as the neighboring trade partner of a potentially booming economy? Or will it lose some of its own star power in the region?

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