Vietnam state oil company urges US Navy to allow tanker through blockade, document shows

By Florence Tan, Jonathan Saul and Phil StewartSINGAPORE, May 13 (Reuters) - The trading arm of Vietnam's state oil company has urged the U.S. Navy to allow a crude oil tanker laden with Iraqi oil to sail through its blockade in the Middle East Gulf to provide a Vietnamese refinery with critical supplies, PVOIL said in a letter on Tuesday. The U.S. military has expanded its shipping blockade on Iran to include cargoes deemed contraband, although it has said other oil exports from the Gulf are fr...