Iran warns U.S. against deal violation

"We will not be the first to violate the accord, but they should definitely know that they will regret it if they violate it", Rouhani said in a conference in Tehran marking National Nuclear Technology Day.

U.S. President Donald Trump will regret it if he pulls out of the nuclear deal with Iran, President Hassan Rouhani said on Monday, warning Mr. Trump that Tehran's response would be stronger than he thinks.

In January, Trump announced he is waiving the United States sanctions against Iran for the "last time". Trump has effectively set that as a deadline for European powers to fix what he called "the awful flaws" of the deal.

Iran has warned that it would ramp up its nuclear program if the JCPOA collapses, to achieve a more advanced level than before the deal.

The rial had fallen to 47,000 to a dollar in early February from about 36,000 in mid-September on concerns about Iran's agreement with world powers to curb its nuclear program in return for the lifting of most worldwide sanctions.

These comments are supposed to "warn" the United States and the other signatories to the nuclear deal against making changes to the deal, which at present largely benefit Iran and no other country.

Rouhani was speaking as Tehran marked National Nuclear Technology Day.

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President Rouhani referred to his 12 meetings with his Russian counterpart Vladimir Putin in recent years, and added, "Anytime we met, we have moved one step forward in deepening ties and cooperation".

Jahangiri said the move will effectively unify Iran's currency, which has been trading in a two-tier system for several years -- the Central Bank of Iran controls an official rate for business traders and companies, and the unregulated market of commercial, Main Street currency vendors and unlicensed dealers has used a higher rate.

"We resolutely oppose the use of chemical weapons by any country, any organisation, any person, for any reason, under any circumstances", Chinese foreign ministry spokesman Geng Shuang told reporters during a regular press briefing.

Iran's currency hit a new low on Monday on continued concerns over a return of crippling sanctions if Trump carries out his threat.

The U.S. dollar jumped to as much as 58,000 rials on the open market in the capital Tehran, according to some reports.

The government will sell the USA dollar at a rate of 42,000 rials to all individuals and businesses.