Iran accused Britain of participating in the United States and Israeli war against Iran by granting access to military and logistical facilities under British jurisdiction

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Iran's Supreme Leader Mojtaba Khamenei ordered the armed forces on October 31, 2026, to prepare for an immediate and geographically unrestricted response to any US or Israeli attack

Since Middle East war hostilities began in February 2026, Iran has targeted shipping vessels in the Strait of Hormuz and wider Gulf while requiring ships to obtain Iranian permission to transit

Following joint United States and Israeli strikes on February 28, 2026, Tehran targeted American and Israeli interests in the region while increasing control over the Strait of Hormuz

The United States and Israel launched joint military strikes against Iran on February 28, 2026, killing Supreme Leader Ali Khamenei and other key Iranian leaders

Two men appeared in a London court charged under Britain's National Security Act over a September 27, 2026 security incident at RAF Fairford airbase

UK Prime Minister Andy Burnham stated that activity at RAF Fairford was likely coordinated in Iran, which Tehran's ambassador to Britain denied

United States Air Force bombers were withdrawn from RAF Fairford on security grounds after several British men were arrested outside the base on September 27, 2026

Iran's designation of British military entities took effect on November 1, 2026, under a resolution by Iran's Supreme National Security Council

British prosecutors alleged that one of two men arrested outside RAF Fairford on September 27, 2026 attempted to assist Iranian intelligence operations

Iran's Foreign Ministry characterized the terrorism designation of Britain's military branches as a reciprocal step responding to the UK bringing the Islamic Revolutionary Guard Corps under the UK's State Threats Act

Iran's Foreign Ministry stated that British anti-Iranian policies violated principles of the United Nations Charter regarding national sovereignty and unlawful measures against other states

Iran's Foreign Ministry stated that Britain's MI6 would be subject to an Iranian law on espionage with Israel and other nations

The United States designated Iran's Islamic Revolutionary Guard Corps as a terrorist organization

Freedom of navigation talks at the G20 foreign ministers' meeting in Atlanta were planned to include discussions on Iran, Russia-Ukraine, and China and its smaller neighboring countries

U.S. Secretary of State Marco Rubio held sideline meetings in Atlanta with Saudi Foreign Minister Prince Faisal bin Farhan and Turkish Foreign Minister Hakan Fidan regarding potential U.S. action against Iran

Iranian Supreme Leader Mojtaba Khamenei met with Armed Forces Chief of Staff Ali Abdollahi, IRGC Commander Ahmad Vahidi, and Regular Army Commander Amir Hatami

Iran's state-affiliated Tasnim news agency stated that Supreme Leader Mojtaba Khamenei's directive to prepare an immediate, geographically unrestricted response officially shifted Iran from a regional war doctrine to a war without geographical limitations

Iranian Supreme Leader Mojtaba Khamenei ordered military commanders to update Iran's bank of targets to cover all U.S. and Israeli material and non-material assets

U.S. Central Command Chief Brad Cooper stated that regular Iranian Navy patrols in the Strait of Hormuz have ceased because their military fleet was sunk

Iran Army spokesman Mohammad Akraminia warned that any renewed U.S. military adventurism would cause the fire of war to engulf a wider geography