The United States Treasury Department imposed new sanctions Thursday on a China-based oil refinery and a number of shipping companies accused of handling Iranian crude oil in violation of existing US restrictions. Treasury Secretary Scott Bessent announced the measures, which target entities described as key nodes in the network that allows Iran to export oil despite longstanding American prohibitions.

The sanctioned refinery and shippers are accused of purchasing and transporting Iranian oil, providing Tehran with a critical revenue stream that the administration says funds its nuclear program and regional proxy activities. The designations freeze any US-held assets of the named entities and generally prohibit Americans from doing business with them.

The action comes as the Trump administration pursues a dual-track approach toward Iran — maintaining intensive economic pressure while leaving open the possibility of a diplomatic agreement over Tehran's nuclear program. Bessent, speaking during a visit to the Gulf region, reaffirmed the administration's commitment to enforcing oil sanctions and discussed currency swap lines with Gulf and Asian partners.

The sanctions add to existing friction between Washington and Beijing over trade and economic policy. China has consistently been the primary buyer of Iranian crude, and US officials have repeatedly warned Chinese entities that facilitating Iranian oil exports exposes them to American secondary sanctions. Beijing has generally rejected Washington's unilateral sanctions regime as illegitimate.

Analysts note the timing coincides with broader questions about Iran's internal political stability. Meanwhile, humanitarian observers have raised concerns about the cumulative effect of sanctions and potential conflict scenarios on Iranian civilian access to food and fuel, as well as potential spillover effects on global commodity markets and developing nations.