FILE PHOTO: The logo of Russian state oil company Rosneft is pictured behind a pipe at Samotlor oil field outside the of Nizhnevartovsk
FILE PHOTO: The logo of Russian state oil company Rosneft is pictured behind a pipe at the Samotlor oil field outside the of Nizhnevartovsk, Russia, January 26, 2016. REUTERS/Sergei Karpukhin/File Photo
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