A senior EU official told Reuters Friday that the Vienna negotiations "are on the right track for a final agreement."

According to the official who spoke on the condition of anonymity, "small" progress has been achieved in several files so far. However, the senior official expressed his concern about the timing.

"I have a feeling that we are going too slow. It would be an incredible mistake if, because of timing, we would not get a good solution," he indicated.

"Still, I think that we will have an agreement...and I think that it will be rather sooner than later," the EU official pointed out.

One document, three annexes

In the same context, Iranian media revealed the details of the documents that the negotiating teams are working on in Vienna regarding the nuclear agreement.

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Mehr news agency reported that the Iranian negotiating team and members of the 4+1 (Russia, China, Britain, France, and Germany) are currently working on one document and three annexes, noting that the main document has become a "decision draft".

According to the agency, the first annex deals with the lifting of sanctions and explains the lifting of US sanctions on Iran.

The second annex is related to Iran's nuclear commitments, as it describes Iran's steps and how to return back from reducing its nuclear commitments after the US withdrawal from the JCPOA in 2018.

The last annex "refers to the implementation of the commitments by different parties and the measures that need to be taken by them to implement the agreement," indicated Mehr. 

Blinken: Deal still possible

It is noteworthy that US Secretary of State Antony Blinken said Thursday that reviving the Iran nuclear deal is still possible,  after "modest progress" in the Vienna talks.

For his part, US President Joe Biden underscored Wednesday, during his speech marking his first year in office, that it was "not time to give up" on the nuclear talks, insisting that "there is some progress being made."

Iranian Foreign Minister Hossein Amir-Abdollahian had announced previously that the parties to the Vienna talks were close to an agreement.

Ongoing negotiations to revive the nuclear deal resumed on November 29, after being suspended in June.

In 2018, Washington withdrew from the agreement signed with Iran in 2015 and re-imposed severe sanctions on Tehran.