This compares with the 29.5m barrels a day flowing from the taps of Opec's 11 members - Saudi Arabia, United Arab Emirates, Algeria, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar and Venezuela. Opec met at the weekend, approving plans to cut back their combined production by 1.5m barrels a day, representing nearly 2% of the world's output. However, the Russian oil industry is clearly big enough to limit the cartel's room for manoeuvre.