The United States unveiled sweeping sanctions Tuesday against almost 50 individuals and companies it says were part of a "shadow banking" network that moved billions of dollars for Iran's military.
The sanctions target a network of Iranian exchange houses and foreign firms that enabled Iran's defense ministry and Islamic Revolutionary Guard Corps (IRGC) to disguise revenues generated abroad, the Treasury Department said in a statement.
Revenue was used to procure and develop advanced weapons systems like unmanned aerial vehicles (UAVs), and also fund regional proxies including Yemen's Houthi rebels, the Treasury said.
"The United States is taking action against a vast shadow banking system used by Iran's military to launder billions of dollars of oil proceeds and other illicit revenue," Treasury deputy secretary Wally Adeyemo said in a statement.
"We have sanctioned hundreds of targets involved in Iran's illicit oil and petrochemical-related activity since President Biden took office, and we will continue to pursue those who seek to finance Iran's destabilising terrorist activities," he added.
The sanctions unveiled Tuesday target companies and individuals around the world, including Iran, Turkey, Hong Kong, the United Arab Emirates (UAE) and the tiny Pacific island nation of the Marshall Islands, which has a defense and security agreement with the United States.
