Iran's Nuclear Program Survives Five Weeks of US-Israeli Strikes, Retains Bomb-Making Capability and Leverage in Talks

Apr 13, 2026

Iran's nuclear program has survived five weeks of U.S. and Israeli bombing with most bomb-making infrastructure intact, including nearly 1,000 pounds of near weapons-grade uranium and likely operational centrifuges at underground sites. While strikes destroyed labs and research facilities and damaged weaponization capabilities at sites including Parchin and Isfahan, Iran retained critical leverage as negotiations resume, with Vice President JD Vance identifying nuclear ambitions as the critical flashpoint in collapsed Islamabad talks. The Trump administration demands Iran end all domestic uranium enrichment as a non-negotiable red line, while former officials warn Iran's negotiating demands will be higher than February talks when Tehran offered to dilute its 60% enriched uranium to 20%. Experts assess that significant damage to weaponization capacity creates bottlenecks in Iran's ability to build a warhead, though uninspected enrichment sites and fortified tunnel complexes at Natanz and Isfahan remain beyond reach of even the most powerful U.S. weapons.

Survival of Iran's Nuclear Capabilities Despite Military Strikes

▪The tunnels at Isfahan are thought to house an enrichment site that Iran declared in June 2025 but that has never been inspected.
▪The International Atomic Energy Agency says the enrichment site at Isfahan may not be operational.
▪The U.S. destroyed nuclear-related buildings at Isfahan with Tomahawk missiles during the 12-day war last year.
▪Iran held on to its stockpile of nearly 1,000 pounds of near weapons-grade uranium.
▪The U.S. dropped Massive Ordnance Penetrator bombs on two uranium enrichment sites, Fordow and Natanz, during the 12-day war last year.

Impact on US-Iran Nuclear Negotiations and Leverage

▪During February talks, Iran offered to dilute the 60% highly enriched uranium to at most a 20% level.
▪White House press secretary Karoline Leavitt said on Wednesday that Iran had indicated it was prepared to surrender its enriched uranium.
▪It takes around a week to enrich 60% enriched uranium to weapons grade.
▪Under the 2015 nuclear deal, Iran's enriched uranium stockpile was capped at 3.67% for 15 years.
▪Eric Brewer said Iran is not going to trade away its enriched uranium easily and its demands are going to be higher than they were during talks in February.
▪Eric Brewer is a former White House official who worked on Iran during Trump's first administration.

Uncertainty Around Iran's Nuclear Weaponization Capacity

▪David Albright is a former weapons inspector who is president of the Institute for Science and International Security.
▪The key uncertainty about the attacks on Iran's nuclear program since February 28, 2026 is the extent of damage done to Iran's ability to build a nuclear warhead.