THE US will "increase pressure" on Iran if talks are used to accelerate its nuclear programme.
Talks are scheduled to resume in Vienna on Monday.
The talks are to resume between the US and Iran after a months-long hiatus.
Other "major powers" will also be participating, according to US News.
"If Iran thinks it can use this time to build more leverage and then come back and say they want something better it simply won't work. We and our partners won't go for it," envoy Robert Malley said to BBC Sounds.
The talks are alleged to salvage the 2015 nuclear deal and relieve Iran from hundreds of economic sanctions.
"If that's Iran's approach, which is to try to use the negotiations as cover for an accelerated nuclear programme, and as I say, drag its feet at the nuclear table, we will have to respond in a way that is not our preference," said Malley.
"Nobody should be surprised if at that point there is increased pressure on Iran."
Then-President Donald Trump pulled out of the agreement, which lifted sanctions in and instead imposed restrictions on Iran's atomic activities.
President Joe Biden is willing to reenter the US into the nuclear deal that Trump left.
He has also alleged that he would not back out of the agreement during his administration.
However, Iran and the US continue to battle over the exact sanctions that must be lifted, The Guardian reports.
Iran would also have undone everything it has done to build up its nuclear programme.
The country enters the talks with a new regime after a June election.
Ebrahim Raisi, the new hardline president, and Ali Bagheri Kani, new chief negotiator and deputy foreign minister lead the new regime.
When talks resume Monday, Iran, Russia, China, the UK, France, Germany, and the EU will all be present at the Coburg hotel.
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