U.S. intelligence assessments indicate that Iran’s estimated timeline for developing a nuclear weapon remains largely unchanged at about one year, despite two months of sustained military conflict involving the United States and Israel.
The operations, which began on February 28 under President Donald Trump, were aimed at dismantling Iran’s nuclear capabilities. However, intelligence officials say the core assessment has not shifted significantly.
According to analysts, including former senior intelligence official Eric Brewer, the stability of the timeline is linked to the limited impact of recent strikes on Iran’s most sensitive nuclear materials. While Israel has targeted select nuclear-related facilities, including a uranium-processing site in March, U.S. military action has largely focused on conventional military infrastructure and leadership targets.
A key concern remains Iran’s stockpile of highly enriched uranium (HEU), which is believed to be intact and stored in heavily fortified underground facilities. The International Atomic Energy Agency (IAEA) has reportedly been unable to account for approximately 440 kilograms of uranium enriched to 60 percent.
Intelligence sources believe much of the material may be located in tunnel complexes at the Isfahan Nuclear Research Center, with some officials reportedly considering high-risk ground operations as a potential option to access the sites.
Officials noted that while the current conflict has not significantly altered Iran’s estimated “breakout timeline,” earlier strikes under a June 2025 campaign known as “Operation Midnight Hammer” helped extend the timeline from an earlier estimate of three to six months to about one year, following damage to facilities in Natanz, Fordow, and Isfahan.
U.S. Secretary of State Marco Rubio and other officials maintain that the degradation of Iran’s air defence systems has indirectly weakened its nuclear programme by making enrichment facilities more vulnerable to future attacks.
Israeli operations targeting Iranian nuclear scientists have also reportedly introduced uncertainty into Tehran’s ability to assemble a functional weapon, even if sufficient material is available.
White House spokesperson Olivia Wales reaffirmed the administration’s position, stating that President Trump “does not bluff” when it comes to preventing Iran from acquiring nuclear weapons.
The situation remains tense following an April 7 truce, even as broader regional risks persist, including Iran’s reported moves to restrict shipping through the Strait of Hormuz, a development that has raised global concerns over energy security.