Iran conflict predictions 2026: leadership change, the Strait of Hormuz, war powers, and ceasefire settlement

Decades of confrontation between the United States and Iran escalated into direct military conflict on February 28, 2026, when American and Israeli forces launched Operation Epic Fury. The opening strikes resulted in the death of Ali Khamenei, who had served as Supreme Leader since 1989. In response, Iranian forces initiated missile and drone strikes against regional bases and enforced a naval blockade of the Strait of Hormuz, a maritime passage between Iran and Oman that carries approximately one-fifth of the world's daily oil supply.

Subsequent months featured alternating periods of military engagement, short-term ceasefires, and international diplomatic efforts. Following a U.S. naval blockade of Iranian ports, a temporary memorandum of understanding signed in June at Versailles established a 60-day window for peace negotiations. However, renewed attacks on commercial vessels in July led to a resumption of U.S. airstrikes. On September 22, Steve Witkoff and Jared Kushner held talks with an Iranian delegation on the sidelines of the UN General Assembly in New York, without a reported agreement. Governance in Iran remains centered on the office of the Supreme Leader, while international oversight continues to track maritime traffic via IMF PortWatch satellite monitoring and monitor nuclear material through the International Atomic Energy Agency (IAEA).

Who holds power in Iran, and how would a leadership change happen?

Power in Iran sits with the Supreme Leader rather than with the elected president, so a leadership change is a change in that office. According to the State Department's Country Reports on Human Rights Practices for Iran, the Assembly of Experts selects and may dismiss the supreme leader, while the supreme leader in turn holds indirect influence over the assembly's membership via the Guardian Council's vetting of candidates.

Following the death of Ali Khamenei during the initial February 28 strikes, official leadership transitions remain governed by constitutional procedures involving the Assembly of Experts. Formal determination of the head of state relies on de facto exercise of executive authority over key state institutions, including the judiciary, state media, and armed forces.

Political developments also track prominent opposition figures. Historical accounts detailed in a Congressional Research Service In Focus product outline the role of Reza Pahlavi, the exiled Crown Prince and representative of the royal family deposed in 1979, who has asserted a prominent public role during recent regional instability.

Why does the Strait of Hormuz matter, and what counts as traffic returning to normal?

The Strait of Hormuz matters because it is the only sea route connecting the Persian Gulf to open water, serving as a primary transit corridor for global petroleum and liquid natural gas shipments. Following military disruptions in early 2026, commercial shipping through the waterway dropped significantly, prompting international monitoring of transit recovery.

Official traffic volumes are monitored by IMF PortWatch, an International Monetary Fund platform that tracks vessel transits using automated satellite signals. Standard recovery metrics evaluate the 7-day moving average of transit calls for commercial vessels (including tankers, container ships, dry bulk, general cargo, and roll-on/roll-off carriers) passing through the strait.

A benchmark average of 60 daily vessel calls represents a return toward pre-conflict maritime flow. Specific analytical thresholds measure whether daily transits reach or exceed this 60-ship mark, providing an objective data point to confirm whether freedom of navigation has been restored in the corridor.

Who decides whether the United States goes to war, and what would an invasion require?

Congress holds exclusive constitutional authority to formally declare war under Article I, Section 8 of the U.S. Constitution, which grants legislative power to declare war, issue letters of marque, and establish rules for captures on land and water. However, executive military actions frequently occur without a formal congressional war declaration.

Unilateral military deployments by the executive branch are governed by the War Powers Resolution (50 U.S.C. 1543-1544). The statute requires the President to submit a written notification to Congress within 48 hours of introducing U.S. armed forces into active hostilities. Furthermore, the President must terminate the use of armed forces within 60 calendar days unless Congress enacts a formal declaration of war or specific statutory authorization, with a provision for a 30-day extension upon written presidential certification of military necessity.

A formal declaration of war requires explicit legislative passage by both houses of Congress. In contrast, operational ground actions or amphibious invasions are defined by physical military deployments intended to establish territorial control, independent of formal legislative documentation.

How do ceasefire and peace-talk markets settle?

Formal ceasefires and diplomatic agreements depend on verifiable actions by participating governments rather than public announcements. Official status reflects specific military criteria and signed diplomatic instruments between combatants.

A ceasefire remains in effect as long as neither military force executes prohibited offensive operations against the other. Standard military definitions categorize qualifying violations as direct airstrikes, naval bombardments, or surface-to-surface missile strikes impacting the territory of either nation. Conversely, intercepted projectiles, defensive air-defense launches, small-arms skirmishes, or localized ground incursions are typically excluded from definitions that break a formal cessation of hostilities.

Diplomatic negotiations require formal, in-person meetings between official state representatives. Negotiated settlements generally require a formal written agreement signed by authorized representatives of both the United States and Iran that places verifiable restrictions on Iran's nuclear program while lifting or modifying economic sanctions.

The conflict, the ceasefire and the talks, by date.

• Jun 2025: Israel conducted airstrikes on Iranian nuclear sites, and U.S. forces struck three additional nuclear facilities.
• Jun 2025: The IAEA withdrew its inspectors from Iranian nuclear facilities due to security concerns.
• Feb 2026: U.S. and Israeli forces launched Operation Epic Fury against targets across Iran.
• Feb 2026: White House releases confirmed the death of Supreme Leader Ali Khamenei during initial strikes.
• Mar 2026: The UN Security Council adopted Resolution 2817 addressing regional security, with Russia and China abstaining.
• Mar 2026: Maritime traffic through the Strait of Hormuz experienced severe disruptions due to military engagements.
• Apr 2026: The UN Security Council considered resolutions concerning freedom of navigation through the Persian Gulf.
• Apr 2026: The United States and Iran agreed to an initial two-week ceasefire facilitated by international mediators.
• Apr 2026: The International Maritime Organization reported significant commercial shipping delays in regional waters.
• Apr 2026: The U.S. administration announced an extension of the temporary ceasefire agreement.
• Jun 2026: According to IAEA Board report GOV/2026/33, the agency confirmed it could not verify the composition or location of Iran's enriched uranium stockpile.
• Jun 2026: Representatives from the United States and Iran announced a preliminary peace framework.
• Jun 2026: Both nations signed a memorandum of understanding in Versailles establishing a 60-day window for comprehensive negotiations.
• Jun 2026: Attacks on commercial vessels led to brief retaliatory U.S. strikes on coastal military sites.
• Jun 2026: Both sides agreed to pause strikes, establishing indirect diplomatic talks in Doha.
• Jul 2026: U.S. military strikes resumed following new attacks on commercial shipping in the strait.
• Jul 2026: The U.S. State Department confirmed naval enforcement measures regarding a blockade of Iranian ports.
• Sep 2026: The U.S. Secretary of State reiterated that the Strait of Hormuz must remain open to international maritime commerce.
• Sep 2026: Steve Witkoff and Jared Kushner met an Iranian delegation on the sidelines of the UN General Assembly in New York.