In this file pool photo taken on Tuesday, Dec. 3, 2019, Vladimir Potanin, the billionaire owner of a nickel giant, right, gestures while speaking to Russian President Vladimir Putin in Sochi, Russia. Mr. Potanin is one of the targets of a new Twitter account, @RUOligarchJets, that tracks the whereabouts of aircraft owned by Russian oligarchs. (Mikhail Klimentyev, Sputnik, Kremlin Pool Photo via AP, File) **FILE**
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