The Iranian Foreign Ministry announced the measures on Sunday, citing Britain’s participation in the US-Israeli war against Iran and its decision to place the Islamic Revolution Guards Corps (IRGC) under the country’s State Threats Act 2026.
The ministry said the decisions were made under a resolution of Iran’s Supreme National Security Council and in response to Britain’s actions over the past year.
Under the first measure, MI6, formally known as the Secret Intelligence Service (SIS), has been designated a “hostile group” under Note 2 of Article 1 of Iran’s Law on Intensifying Punishment for Espionage and Cooperation with the Zionist Regime and Hostile Countries against National Security and National Interests.
The ministry said the designation took effect upon the publication of its statement and that the provisions of the law would henceforth apply to the British spying agency.
Under the second measure, the Royal Navy and Royal Air Force have been brought under Iran’s Law on Countermeasures against the United States’ Designation of the IRGC as a Terrorist Organization.
The two British military branches are consequently designated as terrorist organizations under the Iranian legislation.
The Foreign Ministry cited Britain’s provision of military and logistical facilities and bases within territories under its jurisdiction to support the US-Israeli war of aggression against Iran as one of the grounds for the retaliatory measures.
It also pointed to London’s July 13, 2026 decision to place the IRGC under the State Threats Act 2026, describing the move as part of its hostile policies against the Islamic Republic.
The ministry condemned Britain’s policies and actions as contrary to the principles of the United Nations Charter and international law, particularly the principles of respect for national sovereignty and the prohibition of unlawful actions against other countries.
It reaffirmed Iran’s determination to take necessary measures to protect its national security and interests.
“The measures have evidently been adopted in accordance with the principles of international law and within the framework of the principle of reciprocity,” the statement said, adding that the British government would bear responsibility for their consequences.
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