As a crucial deadline in talks between the West and Iran about its nuclear program looms, analysts warned that a successful deal could further compound the glut in global oil markets. Representatives from the U.S., U.K., France, Germany, Russia and China met once again Monday with Iranian officials at the luxury Beau-Rivage Palace hotel in Lausanne, Switzerland. Just the hint of a possible deal weighed on oil markets, with West Texas Intermediate (WTI) futures falling 1.6 percent to 48.08 a barrel by 9:00 a.m. London time, and Brent crude futures falling to $55.93 a barrel. Here, CNBC highlights the key points ... (full story)