Iran's nuclear timeline unchanged despite ongoing war, US intelligence finds

Tuesday 05 May 2026 - 07:18

By: Dakir Madiha

Iran's nuclear timeline unchanged despite ongoing war, US intelligence finds

Two months into a United States military campaign against Iran, American intelligence assessments indicate that the time Tehran would need to build a nuclear weapon has not changed since last summer, when a joint US-Israeli strike pushed that estimate back to roughly nine months to one year. Three sources familiar with the matter confirmed the assessment, which raises fundamental questions about whether the ongoing conflict is achieving one of its central stated objectives.

Despite more than 8,000 military targets struck since the conflict began on February 28, the war has not meaningfully degraded Iran's nuclear capabilities. Before the June 2025 strikes on the nuclear complexes at Natanz, Fordow, and Isfahan, US intelligence estimated that Iran could produce sufficient weapons-grade uranium and assemble a bomb within three to six months. Those strikes extended that window to approximately nine months to one year — a timeline that remains unchanged today. The persistence of this estimate suggests that recent US and Israeli military operations have focused primarily on conventional military targets rather than nuclear infrastructure, a strategic choice driven in part by the absence of nuclear sites that can be safely and effectively destroyed given the damage already inflicted last June.

At the center of the challenge lies Iran's remaining stockpile of highly enriched uranium — approximately 460 kilograms enriched to 60 percent purity, enough to produce around ten bombs if enrichment continues, according to the International Atomic Energy Agency. The bulk of this material is believed to be stored in deep underground tunnels at the Isfahan nuclear complex, beyond the reach of conventional American munitions. Kelsey Davenport Brewer, now vice president of the Nuclear Threat Initiative, stated that Iran still possesses all of its nuclear materials, most likely in deeply buried underground facilities that US weapons cannot penetrate.

Significantly impeding Iran's nuclear progress may now require physically recovering or destroying that stockpile. In early March, reports emerged that the United States and Israel had discussed deploying special forces to secure the highly enriched uranium, an operation that would involve troops on Iranian soil navigating heavily fortified underground sites. Iran appeared to have anticipated such a move: satellite imagery analyzed by the Institute for Science and International Security showed that all entrances to the Isfahan underground complex were buried underground in early February. An apparent US attempt to access the Isfahan site in early April reportedly failed after Iranian air defenses and ground forces detected the operation.

With ceasefire talks continuing but deadlocked over the nuclear question, the fundamental dilemma remains unresolved. How — or whether — the United States can neutralize Iran's buried uranium stockpile has become the defining unsolved problem of the conflict. The stable intelligence timeline underscores a stark reality: military action has set back Iran's nuclear program, but has not eliminated it, and the materials most critical to a potential weapon remain intact and inaccessible underground.