Iran has sent a formal letter to the United Nations Secretary-General and the President of the UN Security Council condemning what it called the “illegal threats” made by U.S. President Donald Trump. The letter, delivered on Friday by Iran’s ambassador to the UN, Amir Saeid Iravani, followed Trump’s warning of possible intervention if Iran used violence to suppress protests. According to Al Jazeera, the Iranian envoy urged UN officials to strongly denounce Trump’s “reckless and provocative statements,” describing them as serious violations of the UN Charter and international law.

In the letter, Iran stated that any attempt to incite or justify internal unrest as a pretext for external pressure or military intervention would constitute a grave breach of the country’s sovereignty, political independence, and territorial integrity. The letter affirmed Iran’s right to defend its sovereignty and held the United States fully responsible for any consequences or escalation arising from Trump’s threats.

The correspondence came amid widespread protests in Iran over rising living costs, during which six people have reportedly been killed in clashes with security forces.