Exclusive: Oil tankers carrying two months of Venezuelan output stuck at sea

MEXICO CITY/SINGAPORE (Reuters) - Tankers carrying nearly two months worth of Venezuelan oil output are stuck at sea as global refiners shun the nation's crude to avoid falling foul of U.S. sanctions, according to industry sources, PDVSA documents and shipping data.Washington is tightening sanctions to cut Venezuela's oil exports and deprive the government of socialist President Nicolas Maduro of its main source of revenue.The OPEC member's exports are hovering near their lowest levels in more..