WASHINGTON: The United States on Thursday imposed sanctions on Iranian petrochemical producers as well as Chinese and Indian brokers, expanding pressure amid a deadlock in negotiations on restoring a nuclear deal.

“Absent a deal, we will continue to use our sanctions authorities to limit exports of petroleum, petroleum products and petrochemical products from Iran,” said Brian Nelson, senior Treasury Department official.

The Treasury Department said it was imposing sanctions on a network of Iranian petrochemical firms including alleged front companies in China and the United Arab Emirates for Iran’s state-owned company and Triliance, a Hong Kong-based company already under US sanctions for its dealing with Iran.

It also took action against China-based broker Jeff Gao and Indian national Mohammad Shaheed Ruknooddin Bhore for allegedly managing business for Triliance.

The United States has sought to prevent any nation from buying Iranian oil since 2018 after then president Donald Trump walked away from a negotiated agreement, in which Iran drastically scaled back its nuclear program in return for promises of sanctions relief.