Sanctions, particularly economic sanctions, have long been a tool of U.S. foreign policy, and few presidents have leaned on them as much as Barack Obama or been as successful at rallying others to do the same. To thwart Iran’s nuclear ambitions, the U.S. has cajoled and bullied much of the world to slash imports of Iranian oil and freeze out Iranian banks. Most of the world has similarly choked off trade with North Korea.

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