China has publicly criticised new United States sanctions aimed at Iran and countries that trade with Tehran, calling the measures "illegal" and warning they risk disrupting normal international commercial ties.
A statement from Beijing condemned the US action, saying the penalties contravene international norms and could harm broader economic relations. The reaction highlights Beijing's opposition to Washington's use of secondary sanctions on third countries.
Washington has said it will move to isolate nations that continue business with Iran. US officials argue such measures are designed to pressure Tehran by curbing its ability to finance sensitive programmes, while also seeking to deter foreign firms and governments from engaging with Iranian entities.
The dispute has a direct economic element: much of Iran's oil is sold to China. That trade relationship has previously insulated Tehran to some degree from Western pressure and is a key reason Beijing has pushed back against unilateral US restrictions.
The disagreement adds to strains between the United States and China over the scope of extraterritorial sanctions and the balance between national security measures and international trade norms. Observers say the clash could complicate diplomatic dealings over Iran and pose challenges for countries and companies caught between the two powers.