An Iranian delegation headed by Foreign Minister Abbas Araqchi arrived in Rome to participate in new Omani-mediated talks with the United States regarding Tehran's nuclear program, according to footage broadcast by Iranian state television on Saturday morning.

The footage shows Araghchi disembarking from an official Iranian plane at night in Rome, where he is leading a second round of "indirect" talks with US Middle East envoy Steve Witkoff.

Rome will host the talks, which will include Araghchi and US Middle East envoy Steve Witkoff, and are mediated by the Sultanate of Oman. This is the second high-level meeting between the two countries since US President Donald Trump withdrew Washington from the landmark nuclear agreement in 2018.

Diplomatic relations between Tehran and Washington were severed shortly after the 1979 Islamic Revolution in Iran. The latest diplomatic efforts come after Trump made the Iranian nuclear issue a priority following his return to the presidency in January.

Trump resumed his "maximum pressure" policy, imposing sanctions on the Islamic Republic, and in March sent a letter to Iranian Supreme Leader Ayatollah Ali Khamenei calling for nuclear talks, under threat of military action against Iran if diplomacy failed.

Trump said Thursday, "I'm in no rush" to resort to military action, adding, "I think Iran wants to talk."

For his part, Araghchi, one of the architects of the 2015 nuclear agreement, said on Friday that Iran "noted a degree of seriousness" from the Americans during the first round, but he questioned their intentions.

"Although we have serious doubts about the US side's intentions and motives, we will participate in tomorrow's negotiations anyway," he said during a press conference with his Russian counterpart, Sergei Lavrov, in Moscow.

In an interview published Wednesday by the French newspaper Le Monde, Director General of the International Atomic Energy Agency (IAEA), Rafael Grossi, said that Iran is "not far" from possessing a nuclear bomb.

During Trump's first term, Washington withdrew from the 2015 nuclear agreement between Tehran and major powers, which provided for the easing of international sanctions on Iran in exchange for restrictions on its nuclear program.

Tehran adhered to the agreement for a year after Trump's withdrawal, before gradually backing away from its commitments.

Araghchi was a negotiator in the 2015 agreement. His counterpart in Rome, Witkoff, is a real estate mogul who was also tasked by Trump with conducting talks on Ukraine.

Iran currently enriches uranium to up to 60%, which is well above the 3.67% limit stipulated in the agreement, but still below the 90% threshold required for military use.

US Secretary of State Marco Rubio urged European countries on Friday to decide whether to activate the "snapback mechanism," which would automatically reimpose UN sanctions on Iran for its non-compliance with the nuclear agreement.

The option to activate this mechanism expires in October of this year.

Iran had previously warned that it might withdraw from the Nuclear Non-Proliferation Treaty if this mechanism were activated.

Grossi, who held talks with Iranian officials during a visit to Tehran this week, said the United States and Iran are "at a critical stage" in the talks, and "we only have a short window of opportunity" to reach an agreement.

Iranian officials have insisted that the talks focus solely on the nuclear program and the lifting of sanctions.

Araghchi said that reaching an agreement with the United States is "likely" if Washington refrains from "making unreasonable and unrealistic demands," without elaborating.

Analysts believe the United States will seek to include discussions on Iran's ballistic missile program, as well as Tehran's support for armed factions in the Middle East.

Araghchi affirmed that Iran's right to enrich uranium is "non-negotiable," after Witkoff called for a complete halt to enrichment. In a previous statement, Witkoff had simply demanded that Iran return to the enrichment cap set in the 2015 agreement.

For its part, Iran's Islamic Revolutionary Guard Corps said on Tuesday that the country's military capabilities were beyond the scope of discussion.

Iran's official news agency IRNA reported that Iran's regional influence and missile capabilities were among its "red lines" in the talks.

For its part, Israel, a US ally, affirmed on Friday its unwavering commitment to preventing Iran from acquiring nuclear weapons, saying it has a "clear course of action" to prevent this.

Khamenei said on Tuesday that Iranians should not pin their hopes on progress in the negotiations, which "may or may not yield results."