A worker checks the valve of an oil pipe at the Lukoil-owned Imilorskoye oilfield, outside the west Siberian city of Kogalym, Russia, in January 2016. Photo: Reuters
A worker checks the valve of an oil pipe at the Lukoil-owned Imilorskoye oilfield, outside the west Siberian city of Kogalym, Russia, in January 2016. Photo: Reuters