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Russian $8.2 Trillion Oil Trove Locked Without U.S. Tech

Even as the decision to stop gas supplies to Ukraine aggravates tensions with the U.S. and Europe, Russia faces a dilemma: it still needs Exxon Mobil Corp., Halliburton Co. and BP Plc to maintain output from Soviet-era oil fields and develop Arctic and shale reserves.

Russia will require Western companies to provide the modern drilling and production gear -- and techniques such as hydraulic fracturing -- that are essential to unlocking its $8.2 trillion worth of barrels still underground.