Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Iran Warns Against US 'Piracy' VOA News Iran iswarningthe United Statesagainstthreateningitstankerscarrying fuel to Venezuela,wheregasoline and oil are indesperatelyshort supply despite Venezuelabeinga major oil production center. As many as fiveIranianshipsloadedwith gasolinearebelieved tobeon their way to theSouthAmericancountry. U.S.sanctionsforbid Iran from selling oil and the U.S. is alsopressuringallcountriesagainstsupplyingfueltoVenezuela, as part ofWashington'sefforts to drivePresidentNicolasMadurofrom power. IranianForeign MinisterJavadZarifwrote a letter Sunday to UnitedNationsSecretary-General Antonio Guterres about Tehran's concernsoverwhatever action the U.S. might take. Iran "reserves its right to take all appropriate and necessary measures and decisive action...to secure its legitimate rights and interests against such bullying policies and unlawful practices," Zarifwrote."This hegemonic gunboat diplomacyseriouslythreatens freedom of international commerce and navigation and the free flow of energy. Zarif said Iranwouldconsider any "coercive measures" by the U.S. as a"dangerousescalation." Iranian officials delivered a similar message to the Swiss ambassador in Tehran who handles all U.S. interests in Iran. .