It was unrealistic to presume that top oil-producing countries meeting in Doha at the weekend would come away with a hard-and-fast production freeze that would drive up the price of crude — and give hope to oil companies and shipping’s battered offshore sector alike.

Anyone who knew their oil-summit history would tell you that Russia and others had frequently promised similar action in the past, only to keep on pumping once the public relations victory had been achieved.

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