Two Iranian cargo ships owned by the state-run Islamic Republic of Iran Shipping Lines have departed a chemical storage port in southeastern China and are heading toward Iran, according to a Washington Post analysis of ship-tracking data, satellite imagery, and Treasury Department records. The vessels, Shabdis and Barzin, were docked at Gaolan port, a hub known for handling industrial chemicals including sodium perchlorate, a key ingredient used to produce solid rocket fuel for Iran's missile program.

Experts cited by the report said the Barzin has previously transported sodium perchlorate and assessed that both ships were likely carrying the substance. Although sodium perchlorate itself is not specifically banned for export to Iran by the United Nations or restricted under the Missile Technology Control Regime, it can be converted into ammonium perchlorate, which is subject to international controls.

China has publicly called for a ceasefire and described its position on the Middle East conflict as 'objective and impartial,' urging major powers to play a constructive role and respect national sovereignty. However, analysts noted that Chinese authorities could have delayed or blocked the ships' departure but did not, calling the decision a deliberate policy choice.

The United States has previously sanctioned several China-based companies and procurement networks accused of supplying missile-related materials to Iran. Beijing has rejected accusations that it supports Iran's weapons programs, arguing that some claims exaggerate the nature of dual-use commercial trade.