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United States President Donald Trump has issued another threat to Iran, writing that it has two days to “make a deal or open up the Hormuz Strait”.

Saturday’s brief, three-sentence post on Truth Social did not reference the ongoing search for a US pilot who is believed to have ejected over Iran after an F-15 fighter jet crashed in the country. Iran has taken responsibility for the downing, the first of its kind since the US and Israeli launched attacks on Iran on February 28.

Stalled negotiations

While Trump did not provide further details about Saturday’s threat, in a series of posts this week, he pledged to attack Iran’s power plants, oil facilities and “possibly all desalinization plants”.

During a national address on Wednesday, he also threatened to bomb Iran “back to the Stone Ages”, and on Friday, he cheered a strike on a bridge that connects Tehran to the Caspian Sea.

Just this week, more than 100 international law experts published an open letter, warning that targeting civilian infrastructure is a violation of the Geneva Convention and could constitute war crimes.

The Trump administration has also offered shifting objectives and plans for ending the war.

Administration officials have repeatedly said that the US prefers a diplomatic solution. Trump, meanwhile, has touted “victories” even as he has hinted at more weeks of attacks.

At the same time, Iran and the US have sent contradictory messages on the progress of peace talks.

On Saturday, Iranian Foreign Minister Abbas Araghchi said Tehran remained open to diplomacy, after Iran rejected an “unreasonable” 15-point plan put forward by the Trump administration.

“What we care about are the terms of a conclusive and lasting END to the illegal war that is imposed on us,” Araghchi said in a post on X.

The US, however, has argued that Iran’s demand that it maintain “sovereignty” over the Strait of Hormuz is a non-starter.

Pakistan has indicated it will continue to try to support ceasefire negotiations despite the ongoing “obstacles”.

No mention of downed pilot

While Trump has not publicly addressed the ongoing search for the US pilot, NBC News reported on Friday that he did not believe the incident would affect any negotiations with Iran.

“No, not at all. No, it’s war,” he reportedly told the network in a phone call.

Nevertheless, experts have warned that the possible Iranian capture of the pilot could create a crisis for Washington, giving Tehran a major leverage point that could snarl any diplomatic resolution.

The incident could also undermine US claims it has a dominant position in negotiations.

Marina Miron, a researcher at King’s College London, said the shooting down of the F-15 undercuts statements from Trump and Pentagon chief Pete Hegseth that the US has established complete control over Iranian airspace.

“Now we have a visible example that Iran still has the capability to target and successfully shoot down US aircraft, making this, of course, very important for Iran to demonstrate the capability to resist,” Miron told Al Jazeera.

“Most likely, the kinds of air defences that Iran is using, such as man-portable air defences, will be much more difficult to locate.”

Any US efforts to rescue the pilot would risk US casualties, Miron added, heightening the risk of further military escalation.

“It’s a race for time, because right now we have this critical window of up to 72 hours where both sides are trying to get hold of the pilot for both military and political purposes,” she said.