Crude oil production at Libya’s largest oilfield, Sharara, has slumped over the past day after an armed military group closed a valve on the pipeline that carries crude oil from the field to the Zawiya port for exports, in yet another global supply scare amid ongoing disruptions in the Middle East. An armed group has closed Valve n.7 on the pipeline, Libya’s National Oil Corporation (NOC) said, adding that the closure caused a pressure buildup within the crude oil pipeline, leading to a significant reduction in production at the Sharara…