Trading sources say President Donald Trump’s new sanctions against Venezuela’s American refining unit, Citgo, have succeeded in making it difficult for the PDVSA subsidiary to order crude for its facilities, a new Reuters report says. Oil distributors now require Citgo to provide prepayment letters or bank letters of credit, instead of allowing the company to employ the standard practice of ordering raw supplies on open credit. Citgo’s refineries produce 750,000 barrels per day of oil, sources said. The company owns three facilities: one in Illinois, one in Texas, and one in Louisiana. Together, they represent 4 percent of American fuel capacity. A pair of Canadian suppliers explained that their companies could not trade with Citgo directly anymore, resorting to third-party sales to avoid a credit risk. Another banker familiar with the matter put it this way: “This is not a credit issue, nobody thinks Citgo is unwilling to pay. […]