A top security official reiterated Iran's stance that the case of international access to Iran's military sites is long closed, warning about the consequences of the US attempts to reopen the issue.
"The matter of access to Iran's military centers is a case already dismissed," Secretary of Iran's Supreme National Security Council Ali Shamkhani was quoted as saying by IRNA on Friday.
The US administration is pushing the UN nuclear watchdog to conduct an inspection of Iran's military facilities, citing unfounded suspicions about undeclared nuclear activities there.
The US envoy to the United Nations, Nikki Haley, paid a visit to the International Atomic Energy Agency's headquarters in Vienna last month to meet with its nuclear experts and Director General Yukiya Amano.
She later acknowledged that the meetings during her trip were meant to press the UN nuclear watchdog to consider inspecting Iran's military sites.
US President Donald Trump has railed against the deal, brokered with Iran in 2015 by his predecessor Barack Obama, alongside five other world powers.
It lifted most of international sanctions against Iran in return for scaling down its nuclear program.
The pact, formally known as the Joint Comprehensive Plan of Action, did not come into effect until a final assessment report by Amano to the IAEA's Board of Governors and the UN Security Council drew a line under the agency's inquiry into Iran's nuclear past.
Proportionate Response
"The Trump administration's unconstructive behavior aimed at seeking pretexts to avoid implementing its commitments under the JCPOA is part of its effort to undermine this international agreement. It will only further weaken the US international position and will prompt a proportionate response from Iran," Shamkhani said.
The inspection of military bases was a major bone of contention in 18 months of negotiations leading to the nuclear deal.
Iran's top authorities have ruled out any foreign access to military sites, describing it as a matter of national security.
Under the accord, the agency needs to justify its access request with adequate, credible evidence of irregularities.
But the US case for the inspections is said to be far from convincing.
Shamkhani said Tehran could not be compelled to assume obligations beyond what the nuclear pact has stipulated.
"The Islamic Republic of Iran will only act within the framework of its agreements and the provisions of the JCPOA, and will not accept any commitment beyond them," he concluded.
