US blockade keeps stranglehold on Iran's economy Energy Sec. Chris Wright details how the U.S. blockade has impacted Iran's oil sector and the role of U.S. companies in Venezuelan oil production. NEW You can now listen to Fox News articles! If negotiations with Iran collapse, the U.S. likely is to move quickly to degrade Tehran’s military capabilities — a campaign analysts say would begin with missile systems, naval assets and command networks before escalating to more controversial targets.