By Fareed Zakaria
Making coercive diplomacy work requires a mixture of threats and promises. In Iran's case, the Obama administration has made threats plenty of times with clarity and credibility.
But while the sticks have been handled shrewdly, the carrots have not. The U.S. has been unable to define for itself or for the world what would be an acceptable deal and, most important, what it is willing to do if Tehran agrees to such a deal. Would sanctions be lifted? Which ones? Would the U.S. stop its efforts to overthrow the regime? Would it be willing to discuss normalization of relations with Iran?
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