CNBC | Oil slips as US sanctions on Iran begin, Tehran defiant CNBC Oil prices fell on Monday as U.S. sanctions against Iran's fuel exports were softened by waivers allowing major buyers to import Iranian crude for a while, while Tehran said it would defy Washington and continue to sell. Brent crude oil was down 30 ... US unleashes sanctions on Iran, hitting oil, banking and shipping Trump Administration Blinks On Iranian Oil Sanctions Oil Trades Near Six-Month Low as Fears of a Shortage Subside |