For four decades, the United States and Iran avoided direct, large-scale war. That ended on February 28, 2026, when the US and Israel launched coordinated strikes on Iranian nuclear facilities, military infrastructure, and leadership compounds across the country, killing Supreme Leader Ali Khamenei in the opening hours. The assault followed the collapse of indirect nuclear negotiations mediated by Oman, after the US demanded Iran dismantle its enrichment sites and Iran refused.
For four decades, the United States and Iran avoided direct, large-scale war. That ended on February 28, 2026, when the US and Israel launched coordinated strikes on Iranian nuclear facilities, military infrastructure, and leadership compounds across the country, killing Supreme Leader Ali Khamenei in the opening hours. The assault followed the collapse of indirect nuclear negotiations mediated by Oman, after the US demanded Iran dismantle its enrichment sites and Iran refused.
Iran retaliated with missile and drone attacks on US military bases across the Gulf, struck oil tankers in the Strait of Hormuz, and hit the US Embassy in Riyadh with drones. Six US service members have been killed and at least 18 seriously wounded. The conflict has pulled in Hezbollah, which resumed attacks on Israel from Lebanon, and disrupted roughly 20 percent of global oil transit through the Strait of Hormuz. With Iran's senior leadership decimated and no ceasefire channel functioning, the war's trajectory depends on whether the US pursues regime change or accepts a negotiated end to Iran's nuclear program.
Iran's most powerful military and intelligence organization, responsible for the country's missile program, proxy network, and defense of the regime.
IN
International Atomic Energy Agency (IAEA)
International organization (UN)
Status: Monitoring nuclear facilities during active conflict; credibility under scrutiny after Natanz reversal
The United Nations nuclear watchdog, responsible for monitoring Iran's nuclear program and verifying compliance with international safeguards.
U.
U.S. Central Command (CENTCOM)
Military command
Status: Directing Operation Epic Fury across the Middle East
The US military command responsible for operations across the Middle East, overseeing all American forces in the region.
UN
United Nations Security Council
International governing body
Status: Deadlocked; unable to pass resolution on the conflict
The principal UN body responsible for maintaining international peace and security, where the US holds veto power.
Timeline
Drones strike US Embassy in Riyadh; IAEA confirms Natanz damage
Military
Two drones hit the US Embassy compound in Riyadh, causing a limited fire and minor damage in the first attack on a US diplomatic compound in the Gulf since the conflict began. Separately, the IAEA reversed its earlier assessment and confirmed structural damage to entrance buildings at the Natanz nuclear enrichment facility, based on new satellite imagery, though it reported no radiation leak.
IRGC closes Strait of Hormuz; Hezbollah attacks Israel from Lebanon
Military
Iran declared the Strait of Hormuz closed and threatened to attack any vessel attempting passage, stranding approximately 150 ships. Hezbollah launched its first attacks on Israel since the November 2024 ceasefire. Israel responded with strikes on Beirut and southern Lebanon, killing at least 31 people. Three US F-15E jets were shot down by Kuwaiti air defenses in a friendly-fire incident; all crew survived.
Iran confirms Khamenei's death; six US troops killed in Kuwait
Military
Iranian state media confirmed Khamenei was killed and declared 40 days of mourning. An Iranian drone struck a tactical operations center at Shuaiba port in Kuwait, killing six US service members. The IRGC claimed attacks on 27 US military facilities and struck three oil tankers.
US and Israel launch coordinated strikes on Iran
Military
The US began Operation Epic Fury and Israel launched Operation Roaring Lion, striking over 1,000 targets including nuclear facilities, IRGC headquarters, air defenses, and leadership compounds. Israeli jets dropped 30 bombs on Khamenei's compound in Tehran, killing the Supreme Leader.
Iran launches retaliatory strikes across the Gulf
Military
The IRGC fired missiles and drones at US military bases in Kuwait, Bahrain, Qatar, the United Arab Emirates, Jordan, Iraq, and Saudi Arabia. Explosions were reported in Dubai, Doha, and Manama. Multiple Gulf states closed their airspace.
Final round of US-Iran nuclear talks begins in Geneva
Diplomatic
US envoys Steve Witkoff and Jared Kushner presented demands that Iran destroy its enrichment sites and surrender all enriched uranium. Iran refused, and the talks collapsed the following day.
IRGC gunboats attempt to seize US tanker in Strait of Hormuz
Military
Six IRGC Navy gunboats tried to intercept the tanker Stena Imperative in the Strait of Hormuz. The ship continued under escort from the destroyer USS McFaul, and a US F-35 shot down an approaching Iranian drone.
Trump announces military buildup heading to Iran
Military
Trump declared 'a massive Armada is heading to Iran,' confirming the largest US military deployment to the Middle East since the 2003 Iraq invasion, including two carrier strike groups.
Massive protests erupt across Iran
Political
Demonstrations fueled by economic collapse spread to cities across Iran, becoming the largest uprising since the 1979 revolution. The government responded with lethal force and shut down internet access on January 8.
Israel launches Twelve-Day War against Iran
Military
Israel struck Iranian nuclear sites, military installations, and senior officials across 27 provinces. The US followed on June 22 with bunker-busting bombs on three nuclear facilities including Natanz and Fordow.
Trump writes to Khamenei demanding nuclear talks
Diplomatic
Trump sent a letter to Iran's Supreme Leader warning of 'serious military consequences' if Iran refused to negotiate limits on its nuclear program.
US kills IRGC commander Qasem Soleimani
Military
A US drone strike killed the commander of Iran's Quds Force at Baghdad International Airport. Iran retaliated five days later with missile strikes on US bases in Iraq, injuring 110 service members but causing no immediate deaths.
US withdraws from Iran nuclear deal
Diplomatic
Trump pulled the United States out of the Joint Comprehensive Plan of Action (JCPOA), reimposing sanctions on Iran and launching a 'maximum pressure' campaign. Iran was in compliance at the time.
Scenarios
1
US achieves stated objectives, declares operations complete within weeks
Discussed by: The White House, which outlined four objectives (nuclear program, missile arsenal, proxy networks, navy); Axios reported Trump floating 'off-ramps' that could end the campaign quickly
The US and Israel destroy enough of Iran's nuclear infrastructure, missile production, and military capacity to declare victory and halt major operations within Trump's stated four-to-five-week timeline. Iran's weakened and decapitated leadership accepts a ceasefire or tacitly stops retaliating. This scenario requires Iran's remaining command structure to conclude that continued resistance is futile, and that no ground invasion follows. Oil markets stabilize as the Strait of Hormuz reopens under implicit threat of further strikes.
2
Conflict escalates into prolonged regional war
Discussed by: The UN Security Council, which warned of wider conflict; analysts at Chatham House and the Atlantic Council; the Arab League, which declared a 'full-scale regional war' had arrived
Iran sustains retaliatory strikes using its remaining missile stockpile and drone fleet while Hezbollah, the Houthis, and Iraqi Shia militias open additional fronts. The Strait of Hormuz remains closed for weeks, pushing oil above $100 per barrel and triggering a global economic shock. Pressure builds for US ground forces, which Hegseth has not ruled out. Congressional opposition intensifies but lacks the votes to override a presidential veto of a War Powers Resolution. The conflict becomes a multi-front war with no clear exit.
3
Iran's government collapses; power vacuum triggers internal chaos
Discussed by: Netanyahu, who stated the operation would 'create the conditions for the brave Iranian people to take their destiny'; Foreign Policy and CSIS analysts examining post-Khamenei succession
With Khamenei dead, multiple senior military commanders killed, and the country already convulsed by mass protests, Iran's government fragments. The IRGC and remaining civilian authorities compete for control. The succession crisis prevents coherent military command, reducing Iran's retaliatory capacity but creating a vacuum that could produce civil conflict, humanitarian crisis, or the emergence of a more hardline faction. The 2003 Iraq parallel looms: toppling the government proves far simpler than stabilizing what follows.
4
Diplomatic channel reopens; ceasefire leads to new nuclear framework
Discussed by: Trump, who claimed Iran's new leadership 'wants to talk'; Iranian Foreign Minister Araghchi, who said Tehran was open to 'serious efforts to halt escalation'; Oman, which mediated previous rounds
Mixed signals from both sides suggest a narrow opening. Trump has publicly expressed willingness to negotiate, and some Iranian officials have not categorically rejected talks, even as security chief Ali Larijani stated Iran 'will not negotiate with the United States.' If a backchannel produces a ceasefire framework — potentially brokered by Oman, Qatar, or China — the conflict could shift from kinetic operations to a coerced diplomatic settlement. This would require both sides to accept outcomes short of their maximalist positions: the US would need to abandon explicit regime change, and Iran would need to accept permanent limits on enrichment.
Historical Context
Operation Praying Mantis (1988)
April 1988
What Happened
After the frigate USS Samuel B. Roberts struck an Iranian mine in the Persian Gulf, the US launched its largest naval engagement since World War II. American forces destroyed two Iranian oil platforms, sank two frigates and several smaller vessels, and shot down two Iranian aircraft — all in a single day.
Outcome
Short Term
Iran's navy was crippled and its ability to threaten Gulf shipping was sharply reduced. Both sides avoided further escalation, and the Iran-Iraq War ended four months later.
Long Term
The International Court of Justice ruled in 2003 that the US response was disproportionate. The episode established that direct US-Iran confrontation in the Gulf could remain limited — a precedent the 2026 conflict has shattered.
Why It's Relevant Today
Operation Praying Mantis was the last time US and Iranian forces fought directly before 2026. Its one-day duration and limited scope stand in stark contrast to the current multi-day, region-wide campaign, illustrating how dramatically the scale of confrontation has escalated.
The 2003 invasion of Iraq
March–April 2003
What Happened
The United States invaded Iraq with 130,000 troops, arguing that Saddam Hussein possessed weapons of mass destruction and posed an imminent threat. Baghdad fell within three weeks. No weapons of mass destruction were found.
Outcome
Short Term
Saddam's government collapsed rapidly, and President George W. Bush declared 'Mission Accomplished' on May 1, 2003. The military victory was swift and decisive.
Long Term
The occupation lasted eight years, cost over 4,400 American lives and an estimated 200,000 Iraqi civilian deaths, and destabilized the region. The power vacuum enabled the rise of the Islamic State and expanded Iran's own influence in Iraq.
Why It's Relevant Today
Multiple analysts have drawn direct parallels: a president citing a nuclear threat with a 'ticking clock,' regime change as the objective, and a military campaign that achieves its initial targets quickly. The Iraq precedent raises the central question of 2026: what happens after the bombs stop.
The Soleimani assassination and Iranian retaliation (2020)
January 2020
What Happened
A US drone killed IRGC Quds Force commander Qasem Soleimani at Baghdad International Airport on January 3. Five days later, Iran launched 12 ballistic missiles at Al Asad Airbase in Iraq, injuring 110 US service members but causing no immediate deaths.
Outcome
Short Term
Both sides pulled back from the brink. European and US officials assessed that Iran deliberately calibrated its response to send a message without triggering full-scale war.
Long Term
Iran continued covert retaliation plots for years. The FBI warned as late as December 2025 that Iranian plots against former US officials remained active. The killing removed a key coordinator of Iran's proxy network but did not dismantle it.
Why It's Relevant Today
The Soleimani strike represented targeted escalation without full war — a model the 2026 campaign explicitly rejected. By killing the Supreme Leader and dozens of senior officials, the US and Israel chose the maximalist approach that both sides avoided in 2020.
