Iranian Foreign Minister Hossein Amir Abdollahian visits Oman's Sultan Haitham bin Tareq amid efforts to revive the stalled 2015 nuclear pact.
The step was seen as a significant step taken by Iran's nuclear programme in response to the UN nuclear watchdog resolution calling for Tehran to cooperate in its probe.
The International Atomic Energy Agency said in its report last week that it was "not in a position to provide assurance that Iran's nuclear programme is exclusively peaceful".
Tehran rejects as "unconstructive" a statement by France, Britain and Germany that says its demands were jeopardising talks to revive 2015 nuclear deal with world powers.
The Iranian response has been received and the EU is consulting with the US and the other parties "on the way ahead," a spokesperson for EU foreign policy chief Josep Borrell says.
Iran's nuclear negotiators return to Tehran from Vienna after days of indirect talks on reviving a 2015 deal with Washington and other world powers.
Officials from world powers and Iran are meeting in the Austrian capital for the first time since March, when negotiations — which began in 2021 to reintegrate the United States into the agreement — stalled.
French President Macron had a phone call with his Iranian counterpart Raisi after nuclear talks in Vienna did not have a breakthrough.
High-ranking officials from former US president Donald Trump’s administration are also included on the sanctions list.
Iran's semiofficial Tasnim news agency described the negotiations as finished and having “no effect on breaking the deadlock in the talks”.
Iran refuses to hold direct talks with its arch-foe, the United States, resulting in the "proximity" talks arrangement involving European Union envoy Enrique Mora.
The launch comes a day after EU Foreign Policy Chief Josep Borrell announced that Iran and the United States would resume indirect talks to revive nuclear deal between Tehran and world powers.
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