Iran has sent a formal warning to the United Nations that it will respond “decisively and proportionately” to anymilitary action by the United States, according to a letter delivered to Secretary-General António Guterres. The letter, signed by Amir-Saeid Iravani, the Iranian Ambassador to UN, dated February 19, 2026, points directly to a social media post by President Donald Trump on February 18.
In that post, Trump suggested the US might need to use bases including Diego Garcia in the Indian Ocean and RAF Fairford in England if Iran does not reach a nuclear agreement. "Should Iran decide not to make a Deal, it may be necessary for the United States to use Diego Garcia, and the Airfield located in Fairford, in order to eradicate a potential attack by a highly unstable and dangerous Regime," Trump wrote.
Iran described those words as “an explicit public threat of the use of force.” The letter states that “all bases, facilities and assets of the hostile force in the region would constitute legitimate targets” in a defensive response under international law.
Tehran added that the United States would bear “full and direct responsibility” for any “unpredictable and uncontrolled consequences” that follow such action. The mission wrote that the current military movements and buildup by the US create “a real risk of military aggression,” with potentially catastrophic results for stability across the region.
Iran urged the UN Security Council and the Secretary-General to act “without delay”. It isn't exactly clear what the UN can do to stop the US President.
President Trump has repeatedly said military options remain open if diplomacy fails. He has described a possible deal as the preferred path but has warned that refusal would lead to “bad things” for Iran. Today, whilst speaking with reporters on Air Force One, Trump said Iran has 10-15 days, at best.
Iran’s letter stresses its commitment to diplomacy and the Nuclear Non-Proliferation Treaty. It says Tehran has engaged “constructively, with seriousness and in good faith” in nuclear talks, while calling for the full removal of unilateral US sanctions.
The document repeats that any balanced solution must respect the “inalienable rights” of all states. No immediate reply has come from the United Nations or the US government to the letter. The situation remains tense as the US continues to move military assets to the region.
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