Can Nuclear Talks Overcome Arak?

Amid the thorny nuclear negotiations between Iran and six world powers, most observers have recognized two main sticking points: How much to limit Tehran's ability to enrich uranium, and how sanctions will be lifted. But as meetings resume between Iran and its negotiating partners—the United States, the United Kingdom, France, Russia, China, and Germany, also known as the P5+1—an issue once thought settled is anything but.

The Arak Heavy Water Reactor, also known as IR-40, almost derailed the initial rounds of talks in 2013....

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