The UN nuclear watchdog says inspections of Iran’s nuclear program are possible in principle. The harder question is whether Tehran will allow meaningful access after more than a year of zero international oversight.
IAEA Director-General Rafael Grossi confirmed to the agency’s board that inspectors have returned to Iran and have carried out inspections at facilities unaffected by the June 2026 attacks. But he warned that “more engagement is needed to restore full inspections,” a diplomatic way of saying that the current arrangement does not give the IAEA anything close to a complete picture of Iran’s nuclear activities.
IAEA inspectors left Iran on July 4, 2025, exactly one year ago, two days after Tehran suspended cooperation with the agency. That suspension came after the IAEA found Iran in non-compliance with its safeguards agreement and in the wake of Israeli strikes on Iranian nuclear facilities the month before. The departure of inspectors ended the last remaining international monitoring of Iran’s nuclear program, which had already been crippled by the US withdrawal from the 2015 nuclear deal in 2018.
Since then, Iran has continued to enrich uranium. Western intelligence agencies estimate that Tehran now has enough fissile material for several nuclear weapons, though the IAEA cannot say for certain because its inspectors are not there.
The question of whether inspectors can return has become entangled in the broader US-Iran negotiations to end the war that began in February 2026. Vice President JD Vance claimed in late June that Iran had agreed to allow inspectors back, calling it “a major milestone for the American people” and “the first step in permanently denuclearizing or permanently ending a nuclear weapons program in Iran.”
Iran denied the claim the same day. Foreign Ministry spokesman Esmaeil Baqaei said there has been no change in Iran’s relationship with the IAEA and that any inspections would continue “in accordance with existing procedures” and Iranian law. This was a clear message to Washington: Tehran has not made any new commitments and will not be seen as making concessions under the pressure of war.
Grossi’s more cautious language at the board meeting reflects the gap between what Washington claims and what Tehran is willing to deliver. The inspectors who have returned to Iran are working at sites that were not damaged in the June airstrikes. Whether they will be allowed into the facilities that matter most, including enrichment plants at Natanz and Fordow and any undeclared sites the IAEA believes exist, remains an open question.
The stakes are high. The longer Iran operates without international inspectors, the harder it becomes to verify whether its nuclear program remains peaceful. And the war between the US, Israel, and Iran has made the inspections question both more urgent and more politically charged.
For now, the IAEA has a foothold. But a foothold is not a monitoring regime. Whether Tehran gives Grossi’s inspectors real access or just enough to keep the talks alive will determine whether the world gets an honest answer about Iran’s nuclear ambitions, or another year of silence.
The war has changed the calculation for all sides. Before February 2026, the nuclear standoff was a diplomatic problem with military overtones. Now it is a military problem with diplomatic wrappers. Iran’s nuclear infrastructure has been damaged by Israeli and US airstrikes, but the knowledge and the material remain. The absence of inspectors means the world is flying blind at a time when it can least afford to.