CNBC | Oil hits four-year peak after OPEC shows no sign of turning on the taps CNBC Crude oil prices shot to a four-year high on Tuesday, catapulted by imminent U.S. sanctions on Iranian crude exports and the apparent reluctance of OPEC and Russia to raise output to offset the potential hit to global supply. Brent crude futures were ... Supply concerns push oil settles higher Oil prices hit four-year-high of $81 amid looming Iran sanctions Global oil ends at a nearly 4-year high as producers rebuff Trump's demand to keep crude prices low |