The United States on Wednesday imposed sanctions on a shipping network it said was run by Iran's Revolutionary Guards, saying it sold millions of barrels of oil to benefit Syrian President Bashar al-Assad.
The sanctions on 16 entities, 10 people and 11 vessels were announced just as Iran was threatening to cut further its commitments under a nuclear deal unless the United States eases its pressure.
The Treasury Department said that the Qods Force, a unit of the elite Revolutionary Guards responsible for external operations, had backed both Assad and its Lebanese ally Hezbollah through crude oil shipments, mostly to Syria.