U.S. Secretary of State John Kerry meets with Iranian Foreign Minister Mohammad Javad Zarif, January 16, 2016.
Kevin Lamarque / Reuters

When it was announced a year ago, the Iran nuclear deal stoked intense debate among pundits and policymakers about whether it would accomplish its core purpose: keep Iran from developing nuclear weapons. But in recent months, the criticism has shifted. As the sanctions unwind, observers have grown more concerned about whether Iran is getting the economic relief it had expected and how the unwinding might affect the remaining bans on Iran. 

Under the deal, the United States removed all nuclear-related sanctions on Asian and European business activities involving Iran, but kept them for American entities. The expectation was that Iran

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