The issue of Iran’s nuclear breakout times has gained attention with President Trump contemplating military action against the country’s main underground nuclear sites.
Israeli Prime Minister Benjamin Netanyahu recently claimed that Iran is rapidly progressing towards developing nuclear weapons, a statement that seems to diverge from the U.S. assessment. National Security Director Tarsi Gabbard noted in a Congressional hearing back in March that Iran was not in the process of actively constructing nuclear arms.
When asked about Gabbard’s comments, Trump expressed his disagreement, asserting, “I think they were very close to having it.” This contradicted the more optimistic U.S. intelligence view.
Since Trump’s withdrawal from the nuclear deal in 2018, the ability for nuclear watchdogs to monitor Iran’s stockpiles has been significantly hindered. As a result, experts find it challenging to establish a clear timeline for progress regarding nuclear components.
Heather Williams, a senior fellow at the Center for Strategy and International Studies, pointed out that differing estimates of Iran’s breakout timeline might stem from conversations about various factors. She mentioned that while Gabbard indicated no evidence of weaponization, Iran continues to advance its nuclear capabilities—a combination that complicates the situation further.
Presently, experts suggest it could take Iran about a week or two to produce weapon-grade uranium, but creating functional nuclear weapons would likely take several additional months.
Inevitably, Iran will also need to figure out how to deliver a bomb to distant targets like Israel—be it via missile, aircraft, or other means—all of which adds layers of complexity.
U.S. officials believe there may be up to a three-year gap before Iran would actually be able to deploy nuclear weapons. Meanwhile, Andreas Krieg, a security research lecturer at King’s College London, was even more cautious, estimating an 18-month timeframe. He cast doubt on Israel’s narrative concerning an imminent threat.
Krieg speculated that Israeli intelligence reports may be spun by the government to create a narrative, suggesting the urgency as a preemptive move rather than a direct threat.
An Israeli Defense Force spokesperson did not comment on these recent assessments, though Israel has conducted airstrikes against Iranian nuclear facilities recently, likely aiming to stall Iran’s progress. To fully neutralize Iran’s short-term threat, experts argue that a decisive strike at Fordow, a deeply embedded nuclear site, would be necessary.
The only country with the kind of massive bomb required to breach such fortified locations is the U.S.
On Tuesday, Trump returned early from the G7 Summit in Canada and called a meeting of his national security team to discuss the possibility of sending military support to Israel.
Latest Ratings
A day before Israel’s actions, a report from the International Atomic Energy Agency (IAEA) revealed that Iran had accumulated 400 kilograms of uranium enriched to 60%, raising alarms about compliance with international agreements.
This marked the first time since 2005 that the IAEA reported Iran was violating its non-proliferation commitments, an issue that Williams characterized as significant and concerning.
Experts assert that while 90% enrichment is necessary for weapons-grade uranium, Iran’s production far exceeds what would be required for civilian nuclear power usage.
The 2015 nuclear agreement allowed the IAEA substantial access to monitor Iran’s nuclear sites, but after Trump’s withdrawal, Iran restricted inspections and removed monitoring equipment. Nonetheless, the IAEA maintained some level of investigative authority.
Since at least 2019, U.S. intelligence estimates have indicated that Iran was not actively moving forward with viable nuclear arms. Annual reports typically stated that Iran was not undertaking major nuclear development activities necessary for testable weapons.
Last year, however, the U.S. shifted its stance slightly, acknowledging that Iran had enhanced its ability to produce nuclear weapons if it chose to, while still maintaining that there is no aggressive military program currently underway.
Before launching its recent strike, Israel reported to the U.S. that Iran had updated its research efforts related to nuclear weaponry, but U.S. officials remained skeptical of whether this would lead to actual production.
Various Perspectives
David Deloches, a security research professor, highlighted that Israeli officials may approach the threat more cautiously compared to their American counterparts. He noted that U.S. assessments might consider Iran’s capacities and intentions in a more complacent light, while Israeli assessments are more risk-averse.
Gabbard pointed out earlier this year that there had been a notable shift in Iran’s public discussions regarding nuclear weapons, suggesting a more open endorsement of such capabilities within its decision-making bodies.
However, she reiterated that Supreme Leader Ayatollah Ali Khomeini had not reinstated the nuclear weapons program that was suspended in 2003, indicating that the U.S. does not believe Iran is actively pursuing nuclear arms at this time.
On the other side, Krieg contended that Western intelligence agencies are well aware of Iran’s accelerated push towards nuclear weaponry.
He asserted that agencies like Mossad have effectively operated without constraint within the Iranian political landscape.
