The decision, effective Sunday, was based on a resolution adopted by Iran's Supreme National Security Council, the ministry said in a statement

Iran's Foreign Ministry spokesman Esmaeil Baghaei attends a weekly press conference in Tehran, Iran, Oct. 12, 2026./(Xinhua/Sha Dati)

The Iranian Foreign Ministry on Sunday announced that Tehran had designated Britain's Royal Navy, Royal Air Force and Secret Intelligence Service (MI6) as "terrorist and hostile" entities over the British government's anti-Iran actions over the past year.

The ministry condemned the British government's anti-Iran policies and actions as contrary to the principles of the United Nations Charter and international law, particularly those concerning respect for national sovereignty and the prohibition of unlawful measures against other states.

It reaffirmed Iran's determination to safeguard its national security and interests, citing several "hostile" actions by the British government, including its participation in the war against Iran by making military bases and facilities on British territory available for use, as well as its designation of the Islamic Revolution Guard Corps as a "threat to national security."

The ministry said the measures were adopted in accordance with international law and the principle of reciprocity, adding that the British government would bear responsibility for their consequences.