VIENNA, July 9 — The International Atomic Energy Agency has reported that Iran’s uranium enrichment has reached 84 percent purity, a level just below the 90 percent threshold for weapons-grade material. This finding, documented by IAEA inspectors on March 18, 2025, marks the closest Iran has ever come to nuclear weapons capability under international monitoring. The IAEA, founded in 1957, serves as the United Nations’ nuclear watchdog, responsible for verifying compliance with the Nuclear Non-Proliferation Treaty.
Iran signed the NPT in 1968 and ratified it in 1970, legally binding itself to forgo nuclear weapons in exchange for access to peaceful nuclear technology. The agency first began investigating Iran’s nuclear program in 2003, following revelations of undeclared nuclear facilities.
For communities across Asia, the trajectory of Iran’s nuclear program carries profound implications. A nuclear-armed Iran would fundamentally alter the strategic balance of the Middle East, potentially triggering a regional arms race that could draw in Asian powers. Closer to home, the stability of global energy markets—upon which many Asian economies depend—remains directly tied to the security situation in the Persian Gulf.
A Broken Accord
The Joint Comprehensive Plan of Action, signed in 2015, represented the international community’s most ambitious effort to constrain Iran’s nuclear ambitions through diplomacy. Under the JCPOA, Iran agreed to limit uranium enrichment to 3.67 percent purity—far below the level needed for a weapon. The IAEA confirmed Iran’s full compliance with these limits in 2016, a verification that gave families across the region reason to hope that the nuclear threat had been contained.
That hope proved short-lived. The United States withdrew from the JCPOA in 2018, a decision that fundamentally altered the calculus in Tehran.
Iran began systematically exceeding the enrichment limits established by the agreement. By January 2021, the IAEA had confirmed that Iran was enriching uranium to 20 percent purity—a level that has no civilian application and is widely understood as a technical stepping stone to weapons-grade material. By April 2021, Iran had pushed enrichment to 60 percent purity.
Each successive increase brought Iran closer to the weapons threshold while reducing the time required for a potential breakout. The IAEA’s March 2025 finding of 84 percent enrichment represents a dramatic acceleration of this trajectory.
International Response
The IAEA’s Board of Governors, a body composed of 35 nations, has issued multiple resolutions demanding Iran’s full cooperation with inspectors. The most recent such resolution, passed on March 7, 2025, called on Tehran to comply with its legal obligations under the NPT and provide answers regarding undeclared nuclear materials found at multiple sites. IAEA Director General Rafael Grossi, who has led the agency since December 2019, has consistently pressed Iran to grant inspectors the access they require to verify the peaceful nature of the program.
Grossi’s position places him at the center of what many analysts consider the most dangerous nuclear proliferation challenge in decades. The 84 percent enrichment finding raises urgent questions about whether Iran possesses or has developed the technical capability to produce weapons-grade uranium in a matter of days rather than weeks.
IAEA inspectors have not reported that Iran has enriched to 90 percent, but the gap between 84 percent and 90 percent is considered relatively narrow from a technical standpoint. For the broader international community, the situation presents a stark test of the non-proliferation regime that has helped prevent the spread of nuclear weapons for nearly seven decades. The NPT, which Iran voluntarily joined, rests on a bargain: non-nuclear states forgo weapons in exchange for access to peaceful nuclear technology and security assurances from the five recognized nuclear weapons states.
Iran’s steady march toward weapons-grade enrichment capacity undermines that bargain and raises difficult questions for other nations in Asia that have chosen to remain non-nuclear. The IAEA’s ability to detect and report violations serves as the foundation of the global non-proliferation system, and the agency’s credibility depends on its capacity to verify compliance even when member states resist cooperation.
What Comes Next
The IAEA Board of Governors will likely consider further action in response to the 84 percent enrichment finding. Previous resolutions have stopped short of referring Iran to the UN Security Council, a step that could trigger renewed international sanctions. The board’s 35 member nations represent a diverse coalition of Western powers, developing nations, and non-aligned states, each with its own assessment of how to address the Iranian challenge.
Diplomatic efforts to revive the JCPOA or negotiate a new framework have made little progress since the US withdrawal in 2018. Iran has consistently demanded the lifting of all sanctions as a precondition for returning to compliance, while Western nations insist that Iran must first roll back its enrichment program to the levels established in the original agreement.
Rafael Grossi continues to emphasize that the IAEA requires full access to all nuclear sites and materials in Iran to fulfill its verification mandate. Without such access, the agency cannot provide the international community with the assurances it needs that Iran’s program remains peaceful.
