A worker checks the valve of an oil pipe at the Lukoil company owned Imilorskoye oil field outside the West Siberian city of Kogalym, Russia, January 25, 2016. Russia said on Thursday that OPEC kingpin Saudi Arabia had proposed global oil production cuts of up to 5 percent in what would be the first universal deal in over a decade to help clear a glut of crude and prop up sinking prices. Picture taken January 25, 2016. REUTERS/Sergei Karpukhin
Mining & Energy

Oil tumbles after Doha talks collapse