CNBC | Oil prices tumble after hitting 4-year highs on Iran sanctions fears CNBC Oil prices fell on Thursday after hitting four-year highs, supported by the imminent loss of Iranian supply through U.S. sanctions, but also tempered by the prospect of a rapid production boost from Saudi Arabia and Russia. Brent crude oil futures were ... Traders bet on oil at $100 as Iran sanctions loom Oil slips as Saudi and Russia quietly agree output rise, US stocks swell Oil trades near four-year high as US raises pressure on OPEC |