"If others do not fulfill their obligations by Feb. 21, the government is obliged to suspend the voluntary implementation of the Additional Protocol," Foreign Ministry spokesman Saeed Khatibzadeh said.
"It does not mean ending all inspections by the UN nuclear watchdog...All these steps are reversible if the other party changes its path and honors its obligations," he said, alluding to the United States.
Iran's envoy to the International Atomic Energy Agency wrote on Twitter on Monday that Tehran has informed UN watchdog about its plan next week to end sweeping inspection powers given to the agency under the nuclear pact.
Under legislation enacted by hardline Iranian lawmakers last year, the government is obliged on Feb. 21 to limit IAEA inspections to declared nuclear sites only, revoking its short-notice access to any location seen as relevant for information-gathering, if other parties did not fully comply with the deal.
The Biden administration aims to return the United States to the deal, which his predecessor Donald Trump abandoned in 2018. Under the deal, Iran agreed to curbs on its uranium enrichment program in return for the lifting of sanctions.
After Trump quit and reimposed sanctions, Iran began violating some of the deal's limits on sensitive uranium enrichment. Washington and Tehran now disagree over how best to restore the accord, with both sides demanding the other side act first to return to compliance.
Despite Iran's public hard line that Washington must take the first step, however, several Iranian officials told Reuters last week that the mounting economic pain of US sanctions may push Tehran to show flexibility on terms for restoring the nuclear deal.
Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al-Thani said last week Doha was in consultations to help salvage the deal, and Iranian state media said he would meet Iran's president and foreign minister in Tehran on Monday.
"We welcome efforts by friendly countries like Qatar ... There have been consultations between Tehran and Doha at various levels," Khatibzadeh said.
Iran has long denied striving to develop nuclear weapons through uranium enrichment, though its intelligence minister said last week persistent Western pressure could push Tehran to fight back like a “cornered cat” and seek nuclear weapons.
But Khatibzadeh rejected this, citing a religious decree issued in the early 2000s by the Islamic Republic’s top authority, Supreme Leader Ayatollah Ali Khamenei, banning the pursuit of nuclear arms.