CNBC | 4 oil producers agree output freeze, Iran objects CNBC Brent crude futures pared gains Tuesday following news that Qatar, Saudi Arabia, Russia and Venezuela would lead an effort to freeze output at January levels, dashing hopes of a cut in production. Oil producer Iran swiftly dashed hopes of a deal ... Oil prices rise on talk of output cut Oil powers meet in Doha for private pow-wow as $30 crude woes mount Oil prices surge as producers' meet spurs output cut hopes |