The shift was driven by both necessity and opportunity. Several Canadian cargoes (reported 4 Aframax shipments of high-acid, high-TAN crude) that had been arranged for the December delivery cycle can no longer be sent to the refinery. Those barrels are now being resold on the secondary market, as sanctions make their discharge in China impossible. The result is that Russian crude has become not just the cheapest option for Yulong, but effectively the only one available. Venezuelan oil supplies could also ki ...