The United States said on Monday that talks between Iran and six world powers on a long-term deal for Tehran to limit its nuclear program and see international sanctions lifted will be long and complicated with no guarantee of success. The remarks came from a senior U.S. official, who spoke on condition of anonymity on the eve of the first round of high-level negotiations since an interim deal struck on November 24 under which Tehran curbed some nuclear activities for limited sanctions relief. “These next days this week are the beginning of what will be a complicated, difficult and lengthy process,” the administration official told reporters in the Austrian capital. “When the stakes are this high and the devil is truly in the details, one has to take the time to ensure the confidence of the international community in the result,” the official said. “That can’t […]