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Iran since 1979: revolution, crises and wars with Israel and the United States

This dossier traces the Islamic Republic of Iran from Ruhollah Khomeini’s return in February 1979: the monarchy’s overthrow, the hostage crisis, the Iran-Iraq War, Ali Khamenei’s succession, sanctions, domestic protests and nuclear negotiations. It also follows regional confrontation through Tehran’s allies, rapprochement with Saudi Arabia and the transition to direct Iran-Israel attacks in 2024. The twelve-day war of June 2025 is distinguished from the conflict opened on 28 February 2026 by US and Israeli strikes. The chronology examines Ali Khamenei’s killing and Mojtaba Khamenei’s succession, civilian victims, regional fronts, energy infrastructure, Hormuz, blockades and attempts at agreement. The Qatari consultations that originally defined this dossier remain integrated into the expanded history. Sourced entries distinguish established facts, announcements, attributed responsibility and unverified outcomes. The reconstruction selects principal milestones rather than recording every military operation. No final, consistent human toll across all theatres is established here. Dates without a known time are ordered by calendar day.

Last updated : 66 key moments

Where things stand

As of 1 November 2026, the available sources establish no Hormuz reopening agreement from the Doha consultations. Tehran also announced terrorist designations for the Royal Navy and RAF and a hostile-group designation for MI6; the decision's practical effects are not established.

US recovers second aviator from F-15 shot down in Iran

On 5 April 2026, the United States announced the recovery of the second crew member of an F-15E shot down in Iran on 3 April.

The pilot had been rescued earlier; the weapons systems officer had remained isolated in mountainous terrain. Donald Trump described him as wounded but alive.

US accounts described a special forces operation supported by extensive air assets. Iranian claims about aircraft destroyed and tactical details were not all independently verified. The rescue alone did not establish absolute control of Iranian airspace.

Sources 2

South Pars and Ras Laffan are hit as war reaches Gulf gas infrastructure

On 18 March 2026, installations at Iran’s South Pars field were hit; Iran retaliated against Gulf energy infrastructure, including Ras Laffan in Qatar.

Doha attributed the initial attack to Israel. QatarEnergy announced extensive damage at Ras Laffan after Iranian missile strikes. Authorities reported emergency teams working to contain fires.

The shift from military targets to gas infrastructure directly exposed regional supply capacity. Full damage and shutdown assessments required later evaluation; operators’ announcements must not be converted into an independent estimate.

Sources 2

Mojtaba Khamenei is named supreme leader

On 8 March 2026, the Assembly of Experts announced the selection of Mojtaba Khamenei to succeed his father Ali Khamenei as supreme leader.

Panoramic view of Tehran photographed on 3 December 2019.
Tehran, 3 December 2019. Illustrative archive photograph; it does not show the events of 2026. — GTVM92 — CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/ — 3 décembre 2019, sans modification.

The announcement was broadcast early on 9 March in Tehran, while international dispatches were dated 8 March. The new leader had never held senior elected public office and was described as close to the Revolutionary Guards.

The succession preserved the Islamic Republic’s institutions during the war. It established neither military stabilisation nor acceptance of the choice by Iran’s adversaries.

Sources 2

US submarine sinks Iran’s Dena warship off Sri Lanka

On 4 March 2026, a torpedo fired by a US submarine sank the Iranian warship IRIS Dena off Sri Lanka.

Sri Lankan forces launched a rescue operation. The Associated Press reported 32 survivors and 87 bodies recovered, citing the Sri Lankan navy; these figures describe the toll communicated at that time.

The vessel was returning from a naval exercise hosted by India. The attack extended the confrontation into the Indian Ocean, far from Iranian territory and the Strait of Hormuz. It concerned a warship and must be distinguished from attacks on merchant shipping.

Sources 2

Hezbollah joins the war and Israel strikes Lebanon

On 2 March 2026, Hezbollah opened fire on Israel following Ali Khamenei’s death; Israel responded with strikes in Lebanon.

The Iranian-backed Lebanese movement presented its action as retaliation for the supreme leader’s killing. The expansion opened a distinct front, affecting Lebanese civilians and negotiations for a regional truce.

The same day, the United States announced the loss of three F-15Es mistakenly shot down by Kuwaiti air defences during Iranian attacks; all six crew members were recovered. The two episodes illustrate the war’s geographical expansion.

Sources 2

US and Israel open war against Iran; Ali Khamenei is killed

On 28 February 2026, the United States and Israel launched a strike campaign against Iran. Supreme Leader Ali Khamenei was killed in the opening attacks.

Iranian military and security officials were also among the targets. Iranian confirmation of Khamenei’s death followed the initial US and Israeli announcements; it must not be confused with the time of the attack.

The leader’s death opened a succession at the top of the regime without itself establishing its collapse. Iranian retaliation and regional expansion are documented separately to distinguish the different actors’ actions.

Sources 2

Minab school is hit; investigations document civilian victims

On 28 February 2026, Shajareh Tayyebeh primary school in Minab, southern Iran, was hit as the war opened; children and adults were killed.

Human Rights Watch called on 7 March for a war-crime investigation and noted that neither Washington nor Israel had then acknowledged the strike. Amnesty International subsequently attributed the attack to US forces in its 17 March investigation.

The sequence of investigations matters: later attribution must not be presented as established in the first hours. Published death tolls vary by date and source; this entry does not merge them into a final total.

Sources 2

Geneva talks end without a nuclear agreement

On 26 February 2026, indirect Iran-US talks in Geneva ended without an agreement despite progress announced by Omani mediators.

Abbas Araghchi represented Iran; Steve Witkoff and Jared Kushner participated for the United States. Oman announced further exchanges and technical discussions in Vienna.

Disagreements concerned the nuclear programme and sanctions relief, among other issues, against the backdrop of a US military buildup. The mediator’s optimistic assessments did not constitute a signed compromise or a guarantee against the outbreak of hostilities.

Sources 2

Iran shuts down internet amid protests

On 8 January 2026, Iranian authorities imposed a near-total internet shutdown as protests that began in late December spread.

Panoramic view of Tehran photographed on 3 December 2019.
Tehran, 3 December 2019. Illustrative archive photograph; it does not show the events of 2026. — GTVM92 — CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/ — 3 décembre 2019, sans modification.

The movement began over the rial’s depreciation and rising living costs before becoming political. Telephone and digital restrictions isolated the population and sharply reduced available information.

Journalistic investigations documented deaths despite the blackout. Access difficulties prevent partial counts from being treated as final totals. This domestic crisis preceded the February war and must be examined as a distinct sequence.

Sources 2

UN nuclear sanctions are reimposed

In late September 2025, UN sanctions predating the 2015 agreement were reimposed on Iran through the snapback mechanism.

France, Germany and the United Kingdom triggered the procedure on 28 August. Security Council attempts to prevent its completion failed. The UN factsheet dates reapplication to 27 September; press timelines place it on 28 September depending on the reference time zone.

The return of these measures marked the failure of another diplomatic phase after the June war. They added to national sanctions while remaining distinct from them.

Sources 3

Ceasefire ends the twelve-day war

On 24 June 2025, a ceasefire announced by Donald Trump ended the principal phase of fighting between Israel and Iran.

The previous day, Iran had targeted a base in Qatar used by US forces in response to the American bombing of its nuclear sites. The sequence therefore directly involved Qatari territory.

The ceasefire resolved neither the nuclear dispute nor inspection difficulties. The IAEA reported that the attacks interrupted its verification activities in Iran and that inspectors were withdrawn at the end of the month for their safety.

Sources 3