The negotiations on Iran’s nuclear program have been extended again, removing any remaining doubts that, after 18 months of intense negotiations, the key to obtaining a comprehensive agreement still hinges on finding clever, new technical solutions to bridge the remaining disagreements between the parties.

The contours of an achievable deal now seem clear. The United States and its P5+1 partners (China, France, Germany, Russia, and the United Kingdom) have gone very far to accommodate Iran’s preferred terms regarding enrichment capability and gradual sanctions relief.

Yet, Iranian Supreme Leader Ayatollah Ali Khamenei continues to procrastinate because he hopes to tactically leverage U.S. President Barack Obama’s eagerness for a deal into even better terms or he remains strategically uncertain that his regime can survive the political transformation such a deal might introduce. Either way, although negotiations will linger for some additional months, the United States must move on...

Read the full article in Arms Control Today, Vol. 45: No.1, January/February 2015.