Iran warned on Wednesday it would respond to any "unconstructive actions" taken by the UN atomic watchdog after it reported traces of nuclear material at undeclared sites in the Islamic Republic, AFP reports.
On Monday, the International Atomic Energy Agency issued a report in which it said that it still had questions which were "not clarified" regarding previous undeclared nuclear material at three sites in Iran named as Marivan, Varamin and Turquzabad.
Iran and the UN agency agreed in March on an approach to resolve the issue of the nuclear material found at the three sites.
Last year, the IAEA found uranium particles at two Iranian sites it inspected after months of stonewalling.
Although the sites where the material was found are believed to have been inactive for nearly two decades, opponents of the 2015 nuclear deal Iran signed with world powers say evidence of undeclared nuclear activities shows that Iran has not been acting in good faith.
The IAEA board of governors is to hold a meeting on Monday for which Britain, France, Germany and the US have prepared a draft resolution "calling on Iran to cooperate on the question of undeclared sites", according to a European diplomatic source.
"We will respond firmly and appropriately to any unconstructive action at the board of governors," Iranian foreign ministry spokesman Saeed Khatibzadeh said in a statement quoted by AFP.
"The responsibility for its consequences falls on the shoulders of those who see the board of governors and the director-general's report as leverage and a tool of political games against Iran," he added.
In a separate report published Monday, the IAEA estimated that Iran's stockpile of enriched uranium had grown to more than 18 times the limit agreed in the 2015 deal with world powers.
Khatibzadeh on Tuesday claimed that the IAEA had been influenced by Israel when compiling the reports.
"Unfortunately, this report does not reflect the reality of the negotiations between Iran and the IAEA," he told reporters.
"It's not a fair and balanced report," he said, adding, "We expect this path to be corrected."
"It is feared that the political pressure exerted by the Zionist regime and some other actors has caused the normal path of the agency's reports to change from technical to political," Khatibzadeh charged.
The latest reports come as talks to revive the landmark 2015 nuclear deal between Iran and world powers remain deadlocked after stalling in March.
Iran scaled back its compliance with the 2015 deal, in response to former US President Donald Trump’s withdrawal from the agreement in May of 2018, but has held several rounds of indirect talks with the US on a return to the agreement.
Last week, US Special Envoy for Iran Rob Malley told lawmakers that the prospects for reaching a deal with Iran are “tenuous” at best.
A day later, Iranian Foreign Minister Hossein Amir-Abdollahian accused Israel of “taking control” of United States policy, thus preventing a revival of the 2015 nuclear deal.