German shipping firm Bernhard Schulte Shipmanagement (BSM) has moved to legally detain three of Venezuelan PDVSA’s oil tankers to collect on late payments owed to it by the state-run oil company, according to a document seen by Reuters and sources close to the decision.  PDVSA has struggled for years to pay its bills due to falling crude output and limited cash flow, leaving it owing numerous firms worldwide. That was even before the United States in late January imposed tough sanctions on Venezuela’s oil exports, which have since dropped by more than 40 percent. BSM operated 13 of the 32 tankers owned by PDVSA and two Very Large Crude Carriers (VLCCs) jointly owned by PDVSA […]