Iran has not changed its decision to refuse a second round of negotiations with the United States despite a claim by US President Donald Trump that his negotiating team was on its way to Pakistan, Tasnim News Agency reported on April 20.

The agency, which is affiliated with Iran's Islamic Revolutionary Guard Corps, said Tehran's participation in talks remained conditional on certain preconditions being met. The US naval blockade on Iranian ports remained the main obstacle.

Trump had said the previous day that US Vice President JD Vance and other members of the American negotiating team were heading to Islamabad. Trump made similar comments earlier in the week.

The Pakistani mediator had raised the blockade issue with Trump and was continuing to relay messages between the two sides, Tasnim said. However, the messages exchanged also contained what the agency described as further American "overreach" that did not give a clear horizon for negotiations to succeed.

The Iranian delegation believed that as long as Washington failed to look at the situation realistically and continued with what Tasnim called the same miscalculations that led to its heavy military defeat, talks would amount to a waste of time. Iran would not accompany the United States in such a process, the agency said.

Iran has no intention of participating in what Tasnim described as "American theatre" until basic obstacles are removed and a clear path to an agreement acceptable to Tehran emerges.

Iran was also considering the possibility that media displays around negotiations were a deception and was prepared for renewed military confrontation and what Tasnim called another punishment of the United States, the agency said.

The hardline tone matches a pattern of escalating Iranian rhetoric ahead of the expiry of the Pakistan-brokered two-week ceasefire on April 22. Trump has separately threatened to "knock out every single power plant, and every single bridge, in Iran" if Tehran did not accept a US-proposed deal.

Outstanding issues between the two sides include the duration of any Iranian uranium enrichment suspension. Washington has proposed a 20-year halt, while Tehran has offered three to five years. Iran has demanded sanctions be lifted, while the US has pressed for highly enriched uranium to be removed from Iranian territory.