"Iran is in a hurry to reach agreement in Vienna..., but this should be within the framework of our national interest," Iranian Foreign Minister Hossein Amirabdollahian told a news conference in Tehran on Monday.
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The talks, with European intermediaries shuttling between Iranian and US representatives, have been held in Vienna since April amid growing Western fears about Tehran's accelerating nuclear advances, seen by Western powers as irreversible unless a deal is struck soon.
Western leaders say time is running out for a viable accord and have accused Iran of stalling to increase its leverage.
Parties involved in the talks, which resumed last week after a 10-day break, have voiced hope about restoring the pact despite what Tehran has said are "key outstanding issues that require political decisions by the West."
In the same press briefing, Foreign Ministry spokesman Saeed Khatibzadeh said that the talks in Vienna had not reached an impasse and that an agreement now depends on "the other side's political decisions.
He also accused the United States of shedding "crocodile tears" over the situation in Yemen, according to Iran's Tasnim news agency.
"Talks are not at a dead-end ... Iran has already taken its political decision by staying in the deal despite the US withdrawal," Khatibzadeh said.
A second Iranian official said Tehran was also insisting on being able to seal and store its advanced centrifuges inside Iran, rather than dismantling and sending them abroad, as Western powers have called for.
He said Iran further wants the removal of some 300 extra sanctions on Iranian entities and individuals not related to the nuclear deal.
Meanwhile, Ali Shamkhani, secretary of Iran's Supreme National Security Council, said on Monday that the talks "have reached a stage where the outcome can be announced without speculation and with certainty."
"The US political decision to realize or refuse to accept the requirements of a credible and lasting deal based on the principles accepted in #JCPOA can replace speculation," he tweeted.
Khatibzadeh further said that a prisoner swap with the United States was on the agenda in parallel with the nuclear talks in Vienna.
"This issue is currently on the agenda in parallel with the Vienna talks. ... But it seems that the US has not made a decision on it. Perhaps it is waiting for the results of the talks."
This is the first time that an Iranian official says official talks over foreigners and dual nationals detained in Iran with the United States have been on the agenda in Vienna. Tehran has refused to directly negotiate with Washington since nuclear talks began last April in Vienna.
Iran is holding several Western prisoners in what human rights organizations have dubbed hostage diplomacy. As in past instances, Tehran is demanding the release of Iranian detained in the US for breaking sanctions laws and related offenses.
European powers, the European Union and Russia are shuttling between the two sides, while there have been more calls in Iran to negotiate directly with the US.
Khatibzadeh also said that the nuclear talks have not "reached a dead end." Ten months after negotiations began still major issues of which US sanctions should be lifted and how Iran should return to its obligations under the 2015 nuclear agreement remain unresolved.
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