WASHINGTON — In an effort to further squeeze the Iranian economy, on Monday the Trump administration imposed new sanctions on vessels, shippers and brokers it said were supporting Iran's petroleum and petrochemical industry.

The administration designated more than 30 individuals and vessels for their alleged involvement in loading and transporting Iranian oil for sale to buyers in Asia. They include oil brokers in the United Arab Emirates and Hong Kong and tanker operators and managers in India and China as well as the heads of Iran’s National Iranian Oil Company and the Iranian Oil Terminals Company.

State Department spokesperson Tammy Bruce said the designated entities had collectively shipped tens of millions of barrels of crude oil worth hundreds of millions of dollars.

Iran has been exporting more oil to China even as........

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