As the U.S. "maximum pressure" campaign continues to hammer his country's economy, Iranian Foreign Minister Javad Zarif recently offered a message of defiance, saying Iran would weather the storm, given its "PhD in sanctions-busting." His rhetorical description of the Islamic republic's resilience in the face of outside pressure is certainly apt, given its track record of survival. But this time around, the current U.S. pressure campaign poses a risk to one of the fundamental pillars of Iran's economy: its increasingly fragile banking and financial sector. ...