The Associated Press
The State Department says Chinese company Zhenrong brokered the delivery of more than $500 million in gasoline to Iran in a six-month period.
Singapore-based Kuo Oil sent $25 million in refined petroleum to Iran, and FAL Oil Co. Ltd. of the United Arab Emirates shipped more than $70 million in refined petroleum to the Islamic republic in late 2010.
The department says all three companies made individual transactions worth more than the $1 million allowable under U.S. law. Annual values cannot exceed $5 million.
The sanctions bar the companies from receiving U.S. export licenses.
The U.S. and its partners are trying to get Iran to halt its disputed nuclear program.