'Opec has confirmed its own death'

The Opec cartel is to continue flooding the world with crude oil despite a chronic glut and the desperate plight of its own members. It is demanding that Russia, Kazakhstan and other producers join forces with Opec before there can be output cuts.Brent prices tumbled almost $2 a barrel to $42.90 as traders tried to make sense of a fractious Opec gathering in Vienna, which ended last week with no production target and no guidance on policy.