The long-term adversaries, who have not had diplomatic relations for more than 40 years, are seeking a new nuclear deal after Trump pulled out of an earlier agreement during his first term in 2018.
Foreign Minister Abbas Araghchi, a seasoned diplomat and key architect of the 2015 deal, and Trump's special envoy Steve Witkoff led the delegations in the highest-level Iran-US nuclear talks since the previous accord's collapse.
Araghchi, who briefly spoke face-to-face with Witkoff, a real estate magnate, during the otherwise indirect meeting in Oman, said the talks would resume next Saturday.
"The American side also said that a positive agreement was one that can be reached as soon as possible but that will not be easy and will require a willingness on both sides," Araghchi told Iranian state television.
"I think we came very close to a basis for negotiation... Neither we nor the other party want fruitless negotiations, discussions for discussions' sake, time wasting or talks that drag on forever," he added.
The White House called the discussions "very positive and constructive".
"Special Envoy Witkoff's direct communication today was a step forward in achieving a mutually beneficial outcome," it said in a statement.
Asked about the talks, Trump told journalists aboard Air Force One: "I think they're going OK. Nothing matters until you get it done."
Oman's foreign minister acted as an intermediary in the talks in Muscat, Iran said. The Americans had called for the meetings to be face-to-face.
However, the negotiators also spoke directly for "a few minutes", Iran's foreign ministry said. It said the talks were held "in a constructive and mutually respectful atmosphere".
The two parties were in "separate halls" and "conveying their views and positions to each other through the Omani foreign minister", Iran's foreign ministry spokesman Esmaeil Baqaei posted on X.
The process took place in a "friendly atmosphere", Omani Foreign Minister Badr Albusaidi said.
- Witkoff open to 'compromise' -
Iran, weakened by Israel's pummelling of its allies Hezbollah in Lebanon and Hamas in Gaza, is seeking relief from wide-ranging sanctions hobbling its economy.
Tehran has agreed to the meetings despite baulking at Trump's "maximum pressure" campaign of ramping up sanctions and repeated military threats.
Meanwhile the United States, hand-in-glove with Iran's arch-enemy Israel, wants to stop Tehran from ever getting close to developing a nuclear bomb.
There were no visible signs of the high-level meeting at a luxury hotel in Muscat, the same venue where the 2015 agreement was struck when Barack Obama was US president.
Witkoff told The Wall Street Journal earlier that the US position starts with demanding that Iran completely dismantle its nuclear programme -- a view held by hardliners around Trump that few expect Iran to accept.
"That doesn't mean, by the way, that at the margin we're not going to find other ways to find compromise between the two countries," Witkoff told the newspaper.
"Where our red line will be, there can't be weaponisation of your nuclear capability," he added.
The talks were revealed in a surprise announcement by Trump during a White House appearance with Israeli Prime Minister Benjamin Netanyahu on Monday.
Hours before the talks began, Trump told reporters: "I want Iran to be a wonderful, great, happy country. But they can't have a nuclear weapon."
Supreme leader Ayatollah Ali Khamenei's adviser Ali Shamkhani said Iran sought "a real and fair agreement".
Saturday's meetings followed repeated threats of military action by both the United States and Israel.
"If it requires military, we're going to have military," Trump said Wednesday when asked what would happen if the talks fail.
- 'Survival of the regime' -
The 2015 deal that Trump abandoned aimed to make it practically impossible for Iran to build an atomic weapon, while at the same time allowing it to pursue a civil nuclear programme.
Iran, which insists its nuclear programme is only for civilian purposes, stepped up its activities after Trump withdrew from the agreement.
The latest International Atomic Energy Agency report said Iran had an estimated 274.8 kilogrammes of uranium enriched to 60 percent, nearing the weapons grade of 90 percent.
Karim Bitar, a Middle East Studies lecturer at Sciences Po university in Paris, said the Iranian government's very survival could be at stake.
"The one and only priority is the survival of the regime, and ideally, to get some oxygen, some sanctions relief, to get their economy going again, because the regime has become quite unpopular," he told AFP.
Germany urges 'diplomatic solution' ahead of Iran-US nuclear talks
Berlin (AFP) April 11, 2025 -
Germany urged Friday a "diplomatic solution" ahead of this weekend's nuclear talks between Iran and the United States after President Donald Trump said military action was possible if negotiations fail.
Longtime adversaries Iran and the United States are set to hold talks on Saturday in Muscat on Tehran's nuclear programme. The West has voiced fears Iran is seeking nuclear bombs, an ambition Tehran denies.
"We need a diplomatic solution," German foreign ministry spokesman Christian Wagner told a press conference, while stressing it was a "positive development that there is a channel for dialogue between Iran and the United States".
Trump last month sent a letter to Iran's supreme leader Ayatollah Ali Khamenei urging negotiations and warning of military action if Tehran refuses.
On Wednesday Trump said military action against Iran was "absolutely" possible if talks failed to produce a deal.
Wagner said that Germany "remains extremely concerned about the Iranian nuclear programme... Iran has continuously escalated the situation, significantly expanding enrichment capacities.
"Finding a resolution to this issue becomes increasingly urgent."
Germany was among the countries that struck a historic accord with Iran in 2015 that saw sanctions relief in exchange for limits on the nuclear programme.
Trump, during his first period as president, withdrew from the deal, and tensions between the West and Tehran have repeatedly flared since.
Iran has held several rounds of talks with Germany, France and Britain about its nuclear programme after reviving engagement with the trio, known as the E3, last year.
Wagner said the "shared goal" of the three European powers was to find a solution that "ensures Iran does not develop nuclear weapons, as this would have enormous destabilising effects on the entire region".
The Europeans were "of course" working "in close coordination with the United States on this matter", he added.
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