As the bloc’s 12 oil ministers meet in Vienna, the march of Isil jihadists in the Middle East is putting Iran and Saudi Arabia on a collision course with explosive consequences
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Thick black smoke rising from the Baiji oil refinery could be seen as a dirty smudge on the horizon as far away as Baghdad after fighters from the Islamic State of Iraq and the Levant (Isil) set fire to the enormous processing plant just over 100 miles north of the capital last week.

The decision to torch the refinery, which once produced around a third of Iraq’s domestic fuel supplies, was made as the insurgents prepared to pull out of Baiji, which they captured last June in a victory that sent shock waves across world oil markets.