Iran’s new Supreme Leader Mojtaba Khamenei has stepped into a high‑wire strategic environment where the country’s nuclear and missile posture sits at the centre of both internal hardliner‑vs‑pragmatist debates and the wider US–Iran war calculus. While Iran continues to publicly insist that its nuclear programme is solely for peaceful, energy‑related purposes and to reiterate the legacy fatwa against nuclear weapons, analysts see Mojtaba’s rise—and the IRGC‑driven propulsion behind it—as a potential inflection point in how Tehran views nuclear deterrence, missile modernisation, and long‑term regime‑survival strategy.
From fatwa to ambiguous nuclear posture
Under his late father Ayatollah Ali Khamenei, Iran maintained a decades‑old policy of being a “threshold” nuclear state: enriching uranium up to weapon‑usable levels, retaining the technical know‑how and stockpiles, yet stopping short of openly weaponising. The key public‑facing anchor of this stance was a 2003 fatwa declaring nuclear weapons “haram” (forbidden) under Islamic law, which Iran has repeatedly cited in international forums. However, critics and experts argue this religious‑legal‑shield was more of a political‑tactical device than a hard red line, allowing Iran to keep breakout options open while avoiding the full‑blown pariah‑status that would come with a declared weapons programme.
Mojtaba Khamenei’s hardline leanings
Mojtaba Khamenei, long an influential behind‑the‑scenes power broker and close to the Islamic Revolutionary Guard Corps (IRGC), has a reputation for aligning with hardline and military‑centric viewpoints. Analysts note that under his leadership the hardliners and IRGC‑linked security‑apparatus institutions are likely to gain more weight in National Security Council‑style deliberations, including those around nuclear doctrine, missile‑force development, and regional‑conflict escalation. This worries Western capitals, where officials already believe Iran can “break out” to nuclear‑weapon status within a matter of months if it formally decides to do so.
The US–Israel war as a nuclear‑policy trigger
The ongoing US–Israel‑led war‑and‑blockade‑style campaign against Iran has sharpened the argument inside Tehran that regime survival may demand a deterrent stronger than conventional missiles and proxies. Senior officials close to the late Khamenei, and some within the current power structure, have publicly suggested that if Iran is attacked with weapons of mass destruction, it would have “no choice” but to develop nuclear weapons in response, while still paying lip‑service to the existing fatwa. The strikes on Iranian nuclear‑infrastructure nodes have damaged enrichment‑related facilities and caused temporary setbacks, but they have not obliterated Iran’s scientific and engineering base, leaving the underlying capability intact.
Missile builds and regional deterrence
Even as the nuclear‑weapon question remains officially ambiguous, Iran’s missile programme under the IRGC has grown dramatically. From short‑range tactical systems to long‑range ballistic missiles and cruise‑missile‑style capabilities, Tehran has positioned its missile force as the backbone of regional deterrence against the US, Israel, and Gulf‑coalition partners. Mojtaba‑era statements have coupled aggressive nuclear‑rhetoric—such as attacks on US nuclear‑weapons legitimacy—with explicit demands that the United States disarm its own arsenal, suggesting a more confrontational stance on nuclear hierarchy and justice‑based disarmament. For Iran, missiles plus a latent nuclear option form a layered deterrent, even if the weapon‑status is kept deliberately opaque.
What this means for global security
For the outside world, the Mojtaba Khamenei period complicates an already grim calculus: the US‑led military and sanctions pressure has hurt Iran’s infrastructure and economy but may also be reinforcing the very logic that hardliners use to justify doubling down on nuclear and missile capabilities as a shield. Intelligence and policy‑watchers warn that the combination of an IRGC‑aligned Supreme Leader, unresolved regional‑war dynamics, and the lingering ambiguity over Iran’s commitment to the fatwa could push the country closer to a de‑facto nuclear‑deterrent posture, if not an open one. The US‑Israel camp, in turn, is debating how to handle a scenario where Iran either tests that capability or simply signals it more clearly, knowing that any overt move would risk catastrophic escalation but that inaction also risks normalising another nuclear‑threshold power in the Middle East.
