The Letter to the UN: Tehran Warns of ‘Catastrophic’ Response to US Aggression

The shadow of a major regional war has grown significantly darker following an emergency diplomatic exchange at the United Nations. On Thursday, Iran’s UN Ambassador, Amir Saeid Iravani, submitted an urgent letter to the Security Council and the UN Secretary-General, formally condemning what Tehran describes as the "persistent threat of the use of force" by the United States. The correspondence specifically targets President Donald Trump’s recent public declarations regarding the strategic use of the Diego Garcia airbase to neutralize Iranian targets. As military analysts estimate a staggering 90 percent chance of war in the coming weeks, the Iranian regime has warned that any American aggression will be met with a "decisive and proportionate" response, effectively placing all U.S. regional assets in the crosshairs.

The Diego Garcia Escalation

The Iranian complaint centers on a specific social media post by President Trump dated February 18, 2026. In the post, the President explicitly linked the Chagos Islands and British airfields to a potential campaign, stating, "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." Ambassador Iravani argued that these "explicit public threats" constitute a flagrant violation of international law and risk plunging the region into a new cycle of crisis and instability.

Iravani warned that such statements, combined with the "persistent movement and build-up of military equipment and assets by the United States," signal a "real risk of military aggression." He asserted that the consequences of such action "would be catastrophic for the region and would constitute a grave threat to international peace and security." Despite the regime's history of nuclear defiance, the Ambassador insisted that the Islamic Republic "remains fully committed to the purposes and principles of the Charter of the United Nations and to diplomatic solutions," claiming that Tehran has engaged in nuclear talks "with a view to clearly conveying its concerns."

A Decisive Response

The Tehran regime called upon the Security Council to "ensure that the United States immediately ceases its unlawful threats of the use of force" and refrains from actions that could "escalate tensions or lead to a military confrontation." The letter warned that "the Security Council and the Secretary-General must act without delay, before it is too late." Concluding the letter with a threat of its own, the Iranian Ambassador stated that while the regime "neither seeks tension nor war," it will respond to any military aggression.

"However, in the event that it is subjected to military aggression, Iran will respond decisively and proportionately in the exercise of its inherent right of self-defence under Article 51 of the Charter of the United Nations. In such circumstances, all bases, facilities, and assets of the hostile force in the region would constitute legitimate targets in the context of Iran's defensive response. The United States would bear full and direct responsibility for any unpredictable and uncontrolled consequences," he wrote. The letter comes as the US and Iran hold talks on Iran’s nuclear program, while Trump continues to plan for military action should talks fail.