Greek Vessel Laden with Saudi Oil Sails through Hormuz

Four separate supertankers, each carrying 2 million barrels of oil and operated by Iranian tanker group NITC - which is under sanctions and linked to the elite Revolutionary Guards - arrived in waters around Singapore on Monday after sailing from Iran before February 28, according to analysis from U.S. advocacy group United Against Nuclear Iran, which monitors Iran-related tanker traffic through ship and satellite tracking.