FILE - This Jan. 30, 2012, file photo, shows the sign for the Exxon Mobil Torrance Refinery in Torrance, Calif. On Friday, April 21, 2017, the Trump administration denied a request from Exxon Mobil to waive U.S. sanctions against Russia and allow it to resume oil drilling around the Black Sea. (AP Photo/Reed Saxon, File)
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