Since the early 2000s, Iran's covert nuclear weapons program has been the target of a sustained and sophisticated campaign of covert operations widely attributed to Israel and the United States. These operations have ranged from groundbreaking cyberwarfare and the assassination of senior nuclear scientists to explosions at key nuclear facilities. Together, they represent one of the most extensive and consequential shadow conflicts in modern history, aimed at delaying Iran's acquisition of nuclear weapons capability without triggering open conventional warfare. The operations have unfolded against a backdrop of failed diplomatic negotiations, escalating uranium enrichment, and repeated Iranian declarations of its intent to continue its nuclear activities.
Historical Background: Iran's Nuclear Ambitions and the Seeds of Covert Conflict
Iran's nuclear program dates formally to the 1950s under the Shah, with Western assistance provided under the U.S. "Atoms for Peace" initiative. Following the 1979 Islamic Revolution, the program was initially suspended but revived covertly in the 1980s, with significant assistance from Pakistan's A.Q. Khan nuclear proliferation network in the 1990s and early 2000s. The existence of clandestine enrichment facilities at Natanz and Arak was publicly revealed in 2002 by the Iranian opposition group Mojahedin-e Khalq (MEK), triggering international alarm and inspections by the International Atomic Energy Agency (IAEA). It was within this climate of mounting concern that Western intelligence agencies and Israel began developing covert strategies to impede Iran's progress toward a nuclear breakout capability.
Israel, which has long maintained a policy of preventing hostile regional powers from acquiring nuclear weapons—a doctrine demonstrated by its destruction of Iraq's Osirak reactor in 1981 and Syria's Al-Kibar facility in 2007—viewed a nuclear-armed Iran as an existential threat. American concerns centered on regional stability, nuclear proliferation, and the strategic implications of a theocratic state with ballistic missile capabilities obtaining a nuclear arsenal. These shared threat assessments laid the foundation for a covert partnership that would yield some of the most technically innovative and politically consequential operations in the history of intelligence.
Key Facts
- The Stuxnet computer worm, discovered in 2010, is widely assessed to have destroyed approximately 1,000 centrifuges at the Natanz uranium enrichment facility by causing them to spin at destructive speeds while reporting normal operation to operators — the first known use of a cyberweapon to cause physical destruction of critical infrastructure.
- At least six Iranian nuclear scientists were assassinated between 2007 and 2022, including Mohsen Fakhrizadeh, Iran's most senior nuclear weapons scientist, who was killed in November 2020 near Tehran in an operation using a remote-controlled, satellite-operated machine gun — an assassination widely attributed to Israeli intelligence (Mossad).
- In July 2020, a major explosion and fire devastated the advanced centrifuge assembly hall at Natanz, setting back Iran's ability to install next-generation IR-2m and IR-6 centrifuges by an estimated one to two years; subsequent sabotage operations at Natanz in April 2021 caused a complete power blackout in the facility's underground enrichment halls, destroying thousands of centrifuges.
- Iran's Shahid Rajaee port near Bandar Abbas suffered a major cyberattack in May 2020, reportedly carried out by Israel in retaliation for an Iranian cyber operation targeting Israeli water infrastructure — an incident that demonstrated the expanding domain of the covert conflict beyond the nuclear program itself.
- The assassination of Hamas political leader Ismail Haniyeh in Tehran in July 2024 and Hezbollah's Hassan Nasrallah in September 2024, while not directly targeting the nuclear program, demonstrated Israel's sustained intelligence penetration of Iran's most sensitive security environments.
Analysis: Strategic Logic, Attribution, and Impact
The strategic logic underlying these covert operations is rooted in a doctrine sometimes described by analysts as "mowing the grass" — the systematic degradation of an adversary's military and technological capabilities through targeted, deniable strikes rather than a single decisive blow. In the context of Iran's nuclear program, the goal has been to impose cumulative delays sufficient to keep Iran below the nuclear breakout threshold, buying time for diplomacy and sanctions while avoiding the catastrophic regional consequences that a full-scale military strike on Iranian territory would likely precipitate. Analysts at the International Institute for Strategic Studies (IISS) and the Belfer Center for Science and International Affairs have documented how Stuxnet alone set back the Iranian centrifuge program by an estimated eighteen months to two years, demonstrating that precision cyber operations can achieve strategic effects comparable to conventional military action.
Attribution for these operations has never been formally acknowledged. Israel maintains a policy of deliberate ambiguity, neither confirming nor denying responsibility for individual operations, while the United States has similarly avoided official confirmation of its role in Stuxnet, despite detailed reporting by journalists including David Sanger of The New York Times, whose 2012 book Confront and Conceal provided the most comprehensive account of the joint U.S.-Israeli cyber operation, codenamed Operation Olympic Games. Iran has consistently attributed these operations to Israel and the United States, using them to justify domestic repression of dissidents and to bolster nationalist sentiment around the nuclear program.
The targeting of scientists has generated significant ethical debate within the international community. Critics have argued that the assassinations constitute extrajudicial killings in violation of international law. Proponents, however, point to the unique threat posed by Iran's nuclear scientists and the failure of all other instruments — sanctions, diplomacy, and IAEA monitoring — to halt Iran's enrichment activities. The killing of Mohsen Fakhrizadeh, in particular, was seen by Israeli and American intelligence as a major strategic achievement, given his role in leading the AMAD program, Iran's covert nuclear warhead development project that the IAEA and Western intelligence agencies assessed was active until at least 2003 and possibly beyond.
Significance for Israel and Regional Security
For Israel, the covert campaign against Iran's nuclear program represents the front line of an existential strategic imperative. Iranian Supreme Leader Ali Khamenei and successive Iranian presidents have made explicit statements calling for the elimination of Israel, while Iran has simultaneously funded and armed proxy forces — Hezbollah, Hamas, Palestinian Islamic Jihad, and the Houthi movement — whose primary strategic purpose is the encirclement and degradation of the Israeli state. A nuclear-armed Iran would transform this threat environment dramatically, providing Iran with a deterrent umbrella under which its proxies could operate with far greater aggression and reducing Israel's freedom of military action across the region.
The covert operations have thus served not merely as tactical delays but as a core element of Israeli national security strategy in the absence of a credible international mechanism to prevent Iranian nuclearization. With the 2015 Joint Comprehensive Plan of Action (JCPOA) having collapsed following the U.S. withdrawal in 2018 and Iran's subsequent acceleration of enrichment to 60 and then 84 percent purity — approaching weapons-grade levels — the pressure on covert operations as the primary tool of prevention has only intensified. As diplomatic options narrow and Iran's nuclear program continues to advance, the covert conflict between Israel and Iran over the bomb shows no sign of abating, and its outcomes will shape the security architecture of the Middle East for decades to come. Authoritative ongoing coverage and analysis of these developments can be found at the Atomic Archive and through IAEA safeguards reporting.