The Trump ​administration on Tuesday imposed sanctions on an Iranian foreign currency exchange house and ‌what it said were front companies overseeing transactions on behalf of Iranian banks as the US maintains pressure on Tehran.

The move came after Iran said its latest peace proposal to the United States over the US-Israeli-led war​that started February 28 involves ending hostilities on all fronts, including Lebanon, the exit ​of US forces from areas close to Iran, and reparations for destruction caused ⁠by the conflict.

The Treasury Department imposed sanctions on the Iran-based Amin Exchange, also known as ​Ebrahimi and Associates Partnership Company, which it said has a widespread network of front companies spanning ​multiple jurisdictions, including in the United Arab Emirates, Turkiye, and Hong Kong.

The US also blocked 19 vessels it said were involved in shipping Iranian petroleum and petrochemicals to foreign customers.

The Treasury Department said Iranian exchange houses ​facilitate billions of dollars in foreign currency transactions a year, enabling the government to evade ​sanctions and access the international financial system. It said the front companies oversee hundreds of millions of dollars ‌in transactions ⁠on behalf of Iranian banks.

“Iran’s shadow banking system facilitates the illicit transfer of funding for terrorist purposes,” Treasury Secretary Scott Bessent said in a release. “As Treasury systematically dismantles Tehran’s shadow banking system and shadow fleet under Economic Fury, financial institutions must be alert to how the regime ​manipulates the international financial ​system to wreak havoc.”

The ⁠Office of Foreign Assets Control also designated the following, which it said were front companies assisting Amin Exchange:

• China-based Ningbo Jiarui Trading Co., ​Ltd.;

• Hong Kong-based Starshine Petrochemical Corporation Limited;

• Hong Kong-based Vigorous Trading Limited;

• ​UAE-based Alieen ⁠Goods Wholesalers LLC;

• UAE-based Bold Trading FZE;

• UAE-based Materium Group FZE;

• Hong Kong-based Bestfortuna Company Limited; and

• Hong Kong-based Cheng Pan Co., Limited.

The sanctions block US assets of those designated and prevent Americans ⁠from doing ​business with them.

The US also designated vessels for transporting ​Iranian-origin oil, petroleum products and petrochemicals, including the Barbados-flagged liquefied petroleum gas tanker Great Sail, the Palau-flagged products tanker ​Ocean Wave, and the Panama-flagged chemical/oil tanker Swift Falcon.