Earlier on Monday, the Iranian Mehr news agency quoted a Foreign Ministry official saying that a breakthrough had not yet been reached to pave the way for a possible final text of the nuclear agreement. 
 
The agency stated that the official's comments, whose name was not revealed, came in response to the Wall Street Journal, which suggested preparing the final text of the agreement in Vienna "in the next few hours."

"Given that discussions continue on many important issues, we are not yet at a point where we can talk about finalizing the text," he added.

However, the Iranian official stressed that "if the other side takes the appropriate decisions, we can quickly end the negotiations, but we have not reached this stage yet."

Russia's delegate to international organizations in Vienna, Mikhail Ulyanov, said on Sunday that negotiations on Iran's nuclear program "are going in the right direction," adding that "the final text (of the agreement) is not European, but rather common, while the Europeans coordinate its multi-source ideas."

Earlier, Ulyanov had said that he met the European coordinator for negotiations on the Iranian nuclear deal, Enrique Mora, again on Sunday in the Austrian capital, indicating progress. And Ulyanov added, on Twitter, "It seems that we are making progress .. let's remain optimistic."

Indirect Iranian-American talks are continuing with European mediation in Vienna. Several experts from France, Britain and Germany have joined the negotiating delegations and Iranian experts.

Little remains of the 2015 nuclear deal between Iran and the United States, Britain, France, Germany, Russia and China, under which sanctions were lifted on Tehran in return for restrictions on Iranian enrichment activities that the West fears could lead to the making of atomic bombs.

In 2018, US President Donald Trump withdrew from the agreement and reimposed sanctions. For its part, Tehran violated the agreement's restrictions in several ways, including rebuilding its enriched uranium stockpile.

After repeated failures to reach an agreement, the US and Iranian delegations deaded to Vienna for a possible deal; nevertheless, the recent developments don't suggest a breakthrough.