A worker looks at a pump jack at an oil field Buzovyazovskoye owned by Bashneft company north from Ufa, Bashkortostan, Russia, July 11, 2015.REUTERS/Sergei Karpukhin/File Photo
A worker looks at a pump jack at an oil field Buzovyazovskoye owned by Bashneft company north from Ufa, Bashkortostan, Russia, July 11, 2015.REUTERS/Sergei Karpukhin/File Photo