The US and Iran are due to hold talks in Oman on Friday after Tehran requested a change of venue to limit negotiations to its nuclear programme, a regional official said, with a build-up of US forces in the Middle East raising fears of a confrontation.

Iran wanted the meeting to take place in Oman as a continuation of previous rounds of talks held in the Gulf Arab country on its nuclear programme, asking for a change of location from Turkiye to avoid any expansion of the discussions to issues such as Tehran’s ballistic missiles, the regional official said.

Iran has said it will not make concessions on its formidable ballistic missile programme — one of the biggest in the Middle East — calling that a red line in negotiations.

Tehran, which said it replenished its stockpile of ballistic missiles since coming under attack from Israel last year, had warned that it will unleash its missiles to defend the Islamic Republic if its security is under threat.

The regional official, speaking on condition of anonymity, said Iran had since the beginning stressed that it would only discuss its nuclear programme, while Washington wanted other issues on the agenda.

Oil prices extended gains on Wednesday after the US shot down an Iranian drone and armed Iranian boats approached a US-flagged vessel in the Strait of Hormuz, rekindling fears of an escalation between Washington and Tehran.

Iran sought bilateral talks

Trump has warned that “bad things” would probably happen if a deal could not be reached, ratcheting up pressure on the Islamic Republic in a standoff that has led to mutual threats of air strikes and stirred fears of a wider war.

On Tuesday, the US military shot down an Iranian drone that “aggressively” approached the Abraham Lincoln aircraft carrier in the Arabian Sea, the US military said.

Trump told reporters at the White House on Tuesday: “We are negotiating with them right now.”

He did not elaborate and declined to say where he expected talks to take place.

A source familiar with the situation said Trump’s son-in-law, Jared Kushner, was due to take part in the talks, along with US Special Envoy Steve Witkoff and Iranian Foreign Minister Abbas Araghchi.

Ministers from several other countries in the region, including Pakistan, Saudi Arabia, Qatar, Egypt and the United Arab Emirates, had also been expected to attend, but the regional source told Reuters that Tehran wanted only bilateral talks with the US.

In June, the United States struck Iranian nuclear targets, joining in at the close of a 12-day Israeli bombing campaign.

More recently, the US navy built up forces in the region following Iran’s violent crackdown against anti-government demonstrations last month, the deadliest since Iran’s 1979 revolution.

Trump, who stopped short of carrying out threats to intervene, has since demanded nuclear concessions from Iran, sending a flotilla to its coast.

The priority of the diplomatic effort is to avoid conflict and de-escalate tension, a regional official told Reuters earlier.

Tanker incident

Iranian sources told Reuters last week that Trump had demanded three conditions for the resumption of talks: zero enrichment of uranium in Iran, limits on Tehran’s ballistic missile programme and an end to its support for regional proxies.

Iran has long said all three demands are unacceptable infringements of its sovereignty, but two Iranian officials told Reuters its rulers saw the ballistic missile programme, rather than uranium enrichment, as the bigger obstacle.

Since the US strikes in June, Tehran has said its uranium enrichment work — which it says is for peaceful, not military purposes — has stopped.

In another incident on Tuesday, this one in the Strait of Hormuz, the US Central Command said Iran’s Islamic Revolutionary Guard Corps forces had approached a US-flagged tanker at speed and threatened to board and seize it.

Maritime risk management group Vanguard said the Iranian boats ordered the tanker to stop its engine and prepare to be boarded. Instead, the tanker sped up and continued its voyage.