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A worker conducts maintenance work on oil pipes at an oil delivery point operated by Bashneft PAO near Neftekamsk, Russia, on Thursday, March 3, 2016. Bashneft is an upstream and down stream oil & gas provider which explores, produces and refines its own oil and gas which it extracts from brownfield reserves in the Russian Federation. Photographer: Andrey Rudakov/Bloomberg via Getty Images

A worker conducts maintenance work on oil pipes at an oil delivery point operated by Bashneft PAO near Neftekamsk, Russia, on Thursday, March 3, 2016. Bashneft is an upstream and down stream oil & gas provider which explores, produces and refines its own oil and gas which it extracts from brownfield reserves in the Russian Federation. Photographer: Andrey Rudakov/Bloomberg via Getty Images