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The unprecedented move by one set of countries to try to impose a price at which another can sell a commodity has drawn confusion among traders, and - from Moscow - a threat of retaliation
An oil tanker hauling a cargo of Russian crude has been sitting off the coast of the United Arab Emirates for three days, raising the prospect that the gulf state might become customer for Moscow
The IEA is also extremely worried about an impending oil supply crisis
Crude and refined oil products from Russia, Azerbaijan and Kazakhstan pass through export terminals on the sea's eastern edge.
Limited spare production capacity should help to support crude in coming months