The United States has intercepted and seized an Iranian-flagged cargo ship, President Donald Trump confirmed, in an operation that adds tension to an already delicate diplomatic moment between Washington and Tehran.

The seizure comes as the two countries prepare for a second round of talks over Iran's nuclear program, according to reporting by the BBC. Tehran had not issued any public comment on the incident as of the time of reporting.

Trump confirmed the interception without providing extensive detail about the circumstances surrounding the vessel's capture, including its location, cargo, or the legal basis cited by US authorities for the seizure.

Timing raises diplomatic questions

The operation is drawing attention primarily because of its timing. The US and Iran have been engaged in a rare period of direct diplomatic engagement, with negotiations focused on Iran's advancing nuclear activities. A second round of those talks was understood to be in preparation when news of the ship seizure emerged.

Such seizures have occurred previously under the Trump administration as part of broader efforts to enforce sanctions against Iran and restrict the country's ability to export oil and other goods in violation of US measures. Iranian-flagged or Iran-linked vessels have been targeted in the past on similar grounds.

Iran has consistently denied that its shipping activities violate international law and has rejected US sanctions as illegitimate. The government in Tehran has not yet offered a response to this latest incident, leaving the full diplomatic fallout unclear.

Context of US-Iran relations

Relations between Washington and Tehran have been strained for decades, intensifying sharply after the Trump administration's first term withdrawal from the 2015 Joint Comprehensive Plan of Action - the landmark nuclear deal brokered under the Obama administration.

Since then, both countries have engaged in periodic escalations, including sanctions, proxy conflicts, and competing pressures over Iran's uranium enrichment levels. International inspectors have reported that Iran has enriched uranium to levels approaching weapons-grade purity, a claim Iran says is tied to civilian energy needs.

The current round of diplomacy represented one of the more significant openings in years, with talks held through intermediaries including Oman. It remains to be seen whether the ship seizure will complicate or derail those discussions.

Neither the US State Department nor Iranian foreign ministry officials had provided detailed statements on the interception at the time of the BBC's report.