Muscat (Oman) (AFP) - Iran and the United States were preparing for talks on Friday in Oman, with Washington looking to see if there was any prospect of diplomatic progress on the Iranian nuclear programme and other issues while refusing to rule out military action.

The talks – finally confirmed by both sides late Wednesday after uncertainty over the location, timing and format – will be the first such encounter between the two foes since the United States joined Israel’s war against the Islamic republic in June with strikes on nuclear sites.

President Donald Trump’s Middle East envoy Steve Witkoff and Iranian Foreign Minister Abbas Araghchi are due to lead their delegations at the negotiations in the discreet Gulf sultanate, which has periodically acted as a mediator between the countries.

Iranian state news agency IRNA reported late Thursday that Araghchi had arrived in Muscat for the talks.

Iran’s foreign ministry said Thursday evening that it had a “responsibility not to miss any opportunity to use diplomacy” to preserve peace, adding it hoped Washington would participate in the discussions “with responsibility, realism and seriousness”.

The meeting comes just under a month after the peak of a wave of nationwide protests in Iran against the clerical leadership, which rights groups say were repressed with an unprecedented crackdown that has left thousands dead.

“They’re negotiating,” Trump said of Iran on Thursday.

“They don’t want us to hit them, we have a big fleet going there,” he added, referring to the aircraft carrier group he has repeatedly called an “armada”.

Trump initially threatened military action against Tehran over its crackdown on protesters and even told demonstrators “help is on its way”.

But his rhetoric in recent days has focused on reining in the Iranian nuclear programme, which the West fears is aimed at making a bomb.

US Vice President JD Vance told SiriusXM in an interview broadcast Wednesday that Trump would “keep his options open”.

“He is going to talk to everybody, he is going to try to accomplish what he can through non-military means and if he feels like the military is the only option then he is ultimately going to choose that,” Vance said.

- ‘Inflexibility’ towards US demands -

German Chancellor Friedrich Merz, speaking in the Qatari capital Doha, urged Iran’s leadership to “truly enter talks”, saying there was a “great fear of military escalation in the region”.

Turkish President Recep Tayyip Erdogan was quoted by Turkish newspapers as saying: “So far, I see that the parties want to make room for diplomacy,” adding that conflict was “not the solution”.

There had been tensions in the run-up to the talks over whether the meeting should also include regional countries and address Tehran’s support of proxies and its ballistic missile programmes, two US concerns that Iran resisted.

Citing unnamed Iranian officials, the New York Times said the United States agreed the talks would exclude regional actors, and while the meeting would focus on the nuclear issue, it would also discuss missiles and militant groups “with the goal of coming up with a framework for a deal”.

“Iran continues to show inflexibility toward addressing US demands, which reduces the likelihood that Iran and the United States will be able to reach a diplomatic solution,” the US-based Institute for the Study of War said.

With the American threats of military action still looming, the United States has maneuvered a naval group led by aircraft carrier USS Abraham Lincoln into the region, while Iran has repeatedly vowed it will hit back at US bases if attacked.

“We are ready to defend and it is the US president who must choose between compromise or war,” state television on Thursday quoted army spokesman General Mohammad Akraminia as saying, warning that Iran has “easy” access to US regional bases.