"The delegation of the Islamic Republic of Iran is in Vienna with a firm determination to reach an agreement and is looking forward to fruitful talks," Said Khatibzadeh told reporters.

"The government has shown its willingness and seriousness by sending a quality team known to all. If the other side shows the same willingness, we will be on the right track to reach an agreement."

According to local media, the Iranian delegation led by Deputy Foreign Minister Ali Bagheri has been greatly expanded for the new round of negotiations.

"If the United States comes to Vienna with the determination to break the deadlock and overcome the problems on which we did not agree in previous rounds, the path of dialogue will certainly be easier," said the spokesman.

The talks, suspended since June, are to resume between Iran and Britain, China, France, Germany and Russia, with the aim of repairing the Iran nuclear deal reached in 2015.

The United States, which under then president Donald Trump unilaterally left the deal in 2018, is set to participate indirectly in the talks.