Iran War: Global
Impact Assessment

The conflict's roots lie in the post-October 7 regional escalation cycle that began with the Hamas attack on Israel in October 2023. Iran's decision to increase weapons transfers to Hezbollah, the Houthis in Yemen, and Iraqi Shia militias through late 2023 and 2024 produced a sustained low-intensity war across multiple fronts. [Reuters] The US and Israel conducted coordinated strikes on Iranian proxy infrastructure in Syria and Iraq through 2024, but refrained from attacking Iranian territory directly. The tipping point was Iran's April 2024 direct ballistic missile and drone attack on Israel — the first direct Iranian strike on Israeli soil — which killed three Israeli soldiers and damaged the Nevatim airbase. [BBC]

The diplomatic track collapsed in stages. The JCPOA had been in de facto suspension since the US withdrew in 2018 and Iran resumed enrichment beyond agreed limits in 2019. By early 2025, Iran was enriching uranium to 60% purity and had produced enough highly enriched material that independent analysts assessed a breakout to weapons-grade capacity could occur within weeks. [IAEA] A final attempt at de-escalation brokered by Oman in February 2025 — involving a US offer to lift secondary sanctions in exchange for a verified enrichment freeze — collapsed when Iran demanded full sanctions relief before any inspection access was granted. [Reuters]

Israeli Prime Minister Benjamin Netanyahu authorised strikes on Iranian nuclear facilities at Natanz and Fordow on June 12, 2025, with US air support including B-2 bomber strikes on hardened underground facilities. The strikes killed 47 people including senior Iranian nuclear scientists and degraded but did not destroy the uranium enrichment programme. [Reuters] Iran responded with a mass ballistic missile and drone attack on Israel on June 18, 2025, which Israeli and US air defences intercepted at roughly 85% effectiveness, with 12 Israeli fatalities and 140 wounded. [BBC] The conflict entered a sustained military exchange phase from that point forward.

Israel's core objective — preventing Iranian nuclear weapons capability — has driven its military strategy since 2021, when it began planning the strike packages executed in June 2025. [Reuters] The Netanyahu government has explicitly stated it will conduct further strikes if evidence emerges that Iran is reconstituting enrichment capacity. Israel's constraint is that sustained war imposes domestic costs: the northern border displacement of 60,000 citizens has become a political liability, and the IDF's operational tempo across Gaza, Lebanon, and Iran simultaneously is straining force capacity according to assessments cited by the International Crisis Group. [ICG]

The United States under the current administration provided targeting intelligence and B-2 bomber strikes in June 2025 but has since sought to limit further direct military involvement, fearing broader regional escalation and the economic impact of prolonged oil price elevation. [Reuters] The US position at the UN has been to demand verifiable Iranian nuclear disarmament as a precondition for any ceasefire framework — a position Iran has rejected. Iran's Supreme Leader Ali Khamenei has stated publicly that Iran will not negotiate under 'military coercion,' framing any ceasefire negotiation as requiring sanctions removal first. [BBC]

China is the most consequential third-party actor. It purchases an estimated 90% of Iran's oil exports via unofficial channels, providing Tehran with the fiscal lifeline that has prevented economic collapse. [Reuters] China has offered diplomatic mediation twice — both proposals structured to preserve Iranian sovereignty without requiring nuclear verification — which the US and Israel have rejected. Saudi Arabia and the UAE, despite their longstanding rivalry with Iran, have publicly called for de-escalation and are refusing to grant US military access to bases for any expanded Iran operation, a significant constraint on US military options. [Al Jazeera]

The most technically significant debate concerns the effectiveness of the June 2025 strikes on Iran's nuclear programme. The Israeli and US governments have claimed the strikes set Iran's programme back by 3–5 years by destroying centrifuge cascades at Natanz and collapsing the tunnel network at Fordow. [Reuters] Independent analysts from the Arms Control Association and the Institute for Science and International Security assess the damage as 'significant but not decisive,' noting that Iran's scientific knowledge base, design schematics, and dispersed component stockpiles survived. [Arms Control Association] The crucial complication is that IAEA inspectors have been blocked from both sites since March 2026, meaning neither claim can be verified. This is not a disagreement about interpretation — it is a fundamental absence of evidence on the most important technical question of the conflict.

The second major debate concerns the viability of a diplomatic settlement. The US-Israel position is that a ceasefire must be conditional on verified Iranian nuclear disarmament — a position backed by the argument that any ceasefire that leaves Iran's programme intact simply restores the pre-war status quo. The counter-argument, advanced by China, Russia, Qatar, and a significant portion of European governments, is that unconditional demands create a situation where Iran has no incentive to negotiate, prolonging the conflict indefinitely and risking escalation to a full blockade of the Strait of Hormuz. [ICG] The European position — specifically France and Germany — has evolved toward supporting a phased framework where a ceasefire precedes rather than follows nuclear verification, a significant divergence from Washington.

The third contested area is civilian harm and legal responsibility. Iran claims strikes killed 585 people including 210 civilians; Israel states all targets were military infrastructure and personnel. [OHCHR] OHCHR is conducting a formal inquiry but has not yet published findings. The distinction matters for international law: if civilian harm was disproportionate to military objectives, strikes may constitute violations of international humanitarian law — a finding that would affect US and Israeli diplomatic standing in the Global South significantly. No independent verification has been possible, and Iran's claims cannot be corroborated without access.

The strongest evidence in this conflict covers economic and energy market impacts. Oil price movements, supply route data, and macroeconomic indicators (IMF GDP revisions, sanctions tracking) are produced by credible institutions using standard methodologies and are not dependent on conflict-zone access. [IMF] The Strait of Hormuz transit data — approximately 20% of global oil supply, roughly 17–18 million barrels per day — is tracked by the US Energy Information Administration and is among the most reliable numbers in the entire conflict picture. [EIA] Similarly, diplomatic positions are well-evidenced through official government statements, UN voting records, and documented diplomatic communications reported by multiple credible outlets.

Evidence quality degrades significantly when the question touches on events inside Iran. Casualty figures rely on Iranian government releases (which have incentive to exaggerate civilian harm) and OHCHR estimates based on limited access; independent journalism inside Iran has been severely restricted since the conflict began. [OHCHR] The nuclear damage assessment is the most critical evidentiary gap: both the US-Israel claim of a 3–5 year setback and Iranian counter-claims of 'limited damage' are unverified. The IAEA — the only body with the technical capacity and mandate to independently assess the Natanz and Fordow facilities — has been denied access since March 2026. Until inspectors return, the most important factual question in the conflict has no reliable answer.

Iranian domestic political dynamics represent a third area of thin evidence. Western analysts are divided on whether the conflict has strengthened or weakened the Islamic Republic's internal cohesion. Historical precedent from the Iran-Iraq war suggests external military pressure can consolidate regime support domestically; more recent precedent from the 2019 protests suggests that economic deterioration can produce rapid civil unrest. With Iran's economy contracting at -4.2% and inflation reported above 40%, the conditions for domestic instability exist — but no reliable polling or independent reporting from inside Iran is available to assess public sentiment. [IMF]

The most consequential misconception is that the June 2025 strikes permanently ended Iran's nuclear threat. The strikes destroyed physical infrastructure at Natanz and Fordow but could not destroy Iran's scientific knowledge base, component stockpiles held at dispersed locations, or the institutional expertise of its nuclear programme. [Arms Control Association] Historical precedent — Iraq's Osirak reactor strike in 1981, Syria's Al-Kibar reactor destruction in 2007 — shows that military strikes on nuclear infrastructure can delay but have never permanently eliminated a determined state's nuclear ambitions. Iran's 1979-onward programme has survived previous disruptions. The IAEA cannot currently assess what reconstitution has occurred.

A second widespread misconception is that Iran's economy is on the verge of collapse, and that economic pressure will force a diplomatic settlement. Iran's economy has contracted severely — the IMF's -4.2% GDP revision for 2025 and reported inflation above 40% are real. [IMF] But China's purchase of approximately 90% of Iranian oil exports at discounted prices provides Tehran with a fiscal floor that prevents the hard currency crisis that would trigger genuine state insolvency. [Reuters] Iran operated under severe sanctions from 2018 to 2025 without reaching a settlement — the evidence does not support the claim that additional economic pressure will produce diplomatic flexibility.

A third misconception, particularly prevalent in Western media, is that the Iranian population broadly supports the Islamic Republic's military posture. Historical polling from the pre-conflict period (2023–2024) showed deep divisions within Iranian society on the nuclear programme — a 2023 University of Maryland survey found only 39% of Iranians supported uranium enrichment to weapons-grade levels when told this would result in further sanctions. [UMD] Post-conflict polling is unavailable due to access restrictions, but the economic deterioration and displacement suggest the domestic political cost of continuing the conflict is significant and growing.

The 1981 Israeli strike on Iraq's Osirak reactor is the most frequently cited precedent for the June 2025 Iran strikes. Israel destroyed the reactor before it became operational, killing 10 Iraqi soldiers and one French technician. The outcome was the opposite of what was intended: rather than ending Iraq's programme, the strike caused Saddam Hussein to dramatically accelerate and disperse his nuclear efforts. By 1991, when the Gulf War ended, Iraq was estimated to be 12–18 months from a nuclear device — a programme entirely rebuilt after the 1981 strike. [Arms Control Association] The Osirak case is the strongest evidence against the thesis that military strikes permanently end nuclear ambitions in a determined state.

Libya under Muammar Gaddafi in 2003 is the one genuine case of a state with an active nuclear programme voluntarily dismantling it under external pressure. Libya's decision followed direct negotiations with the US and UK that offered a path to economic normalisation and regime security guarantees. The key variable was not military pressure — the US invasion of Iraq in March 2003 was the event that reportedly triggered Gaddafi's decision — but the existence of a credible diplomatic off-ramp that offered regime survival alongside disarmament. [IAEA] The Libya case is regularly cited by those arguing that a negotiated framework is possible with Iran — but Iran's government draws a different lesson: Libya disarmed and Gaddafi was subsequently killed, while North Korea retained its nuclear programme and was not invaded.

North Korea represents the most directly applicable precedent for the scenario where military strikes are off the table and economic pressure has reached its limits. North Korea has operated under comprehensive UN sanctions since 2006, seen its economy contract severely, and nonetheless conducted six nuclear tests and developed intercontinental ballistic missile capability. [UN Security Council] The North Korea case shows that when a regime treats nuclear weapons as existential rather than negotiable, the combination of military strikes (which are impossible once weapons exist) and economic isolation produces a frozen conflict rather than a settlement. The question for Iran is whether the Islamic Republic has concluded — after the June 2025 strikes — that rapid acquisition of a nuclear deterrent is more survivable than remaining in a state of nuclear ambiguity.

The most important variable over the next 12–24 months is whether Iran reconstitutes its nuclear enrichment capacity and whether, if it does, Israel detects this and strikes again. The IAEA access blockage is therefore not just a transparency problem — it is a direct escalation risk. Without independent verification, Israel and the US will rely on intelligence assessments of reconstitution activity. Historical precedent from both the 2007 Syria strike and the 2025 Iran strike shows that Israel acts on intelligence even in the absence of UN authorisation or broad international support. If Iran rebuilds secretly and is detected, a second major strike package is the most likely Israeli response. [Reuters]

The diplomatic pathway is narrow but not closed. The key signal to watch is whether Qatar and Oman's backchannel produces a document that sequences a ceasefire before rather than alongside nuclear verification — the formulation France and Germany have indicated they could support. [ICG] China has economic incentive to enable a deal: a Hormuz blockade or mining incident would disrupt its own oil supply chain, as China's strategic petroleum reserve covers only approximately 90 days of imports. Saudi Arabia and UAE have indicated privately they would support a ceasefire framework that includes IAEA return as a first step — a formulation that provides Iran a face-saving path to verification that differs from full disarmament. [Al Jazeera]

Domestically, Iran's government faces a fiscal crisis that will worsen through 2026–2027 regardless of military outcomes. The IMF's -4.2% GDP contraction for 2025 is likely to deepen given ongoing sanctions tightening and the damage to oil infrastructure. The Islamic Republic has survived economic crises before, but the combination of external military pressure and internal economic deterioration creates conditions for political instability that could either accelerate a diplomatic shift (if pragmatists gain influence) or trigger a hard-line escalation (if the IRGC consolidates power). The direction is genuinely uncertain — which is an honest finding, not a hedge. [IMF]

The base case — assigned 55% probability — is a prolonged frozen conflict through 2027. Iran retains nuclear ambiguity, continues to block IAEA access, conducts periodic missile launches, and activates proxy forces at a level calibrated to impose costs without triggering another major Israeli strike package. Israel conducts occasional precision strikes on reconstitution-related infrastructure. The diplomatic track through Qatar-Oman produces a framework document by late 2026 or early 2027 but fails to achieve Iranian sign-off on verification conditions. China maintains its oil purchase lifeline. Global oil prices remain elevated at $80–90 per barrel. The conflict imposes ongoing costs on all parties but does not escalate to a defining confrontation. [ICG]

The downside scenario — assigned 25% probability — is escalation triggered by one of two events: Israel detecting Iranian nuclear reconstitution and launching a second major strike package, or Iran responding to economic deterioration by mining or blockading the Strait of Hormuz. Either event would trigger a qualitatively different conflict. A second strike package on Iran would likely produce a mass retaliation attempt against Israeli and US assets across the region. A Hormuz closure or mining incident would push Brent crude above $120 per barrel within weeks, trigger a global recession in energy-importing economies, and force the US into a direct naval response. [EIA] The probability is meaningful — 25% — because the intelligence uncertainty around Iran's nuclear activities and the economic pressure on Tehran's government both increase the chance of a miscalculation.

The upside scenario — assigned 20% probability — is a negotiated ceasefire-first framework, followed by phased IAEA return and the beginning of a new diplomatic architecture. The trigger would require China to apply genuine economic pressure on Iran — specifically threatening to reduce oil purchases if Tehran refuses inspection access — combined with the US accepting a ceasefire-before-verification sequencing that France and Germany have advocated. This is not implausible: China's strategic petroleum reserve covers only ~90 days, and a Hormuz closure would damage Chinese energy security significantly. [Reuters] The scenario requires political will from actors (US administration, Iranian pragmatists) who are not currently in a position to deliver it — hence the 20% rating.