The United States on Thursday said it blacklisted two companies based in Hong Kong, one in Shanghai and one in Dubai for helping Iran’s state-owned National Iranian Oil Company (NIOC) export millions of dollars of goods in violation of U.S. sanctions.

The U.S. Treasury Department said it imposed sanctions on the Hong Kong-based Triliance Petrochemical Co. Ltd and Sage Energy HK Limited, China-based Peakview Industry Co Ltd and United Arab Emirates-based Beneathco DMCC.