UN Secretary-General Antonio Guterres has called for diplomatic engagement to resolve differences between the United States and Iran amid a surge in military activities and rhetoric across the Middle East, his spokesperson said on Friday.

“We are very concerned about the heightened rhetoric we’re seeing around the region by the heightened military activities, war games or just military, increased military, naval presence in the region. And we encourage both the United States and the Islamic Republic of Iran to continue to engage in diplomacy in order to settle the differences,” said Stephane Dujarric, the spokesperson for UN secretary-general.

The call for restraint follows a formal letter delivered on Thursday by Amir Saeid Iravani, Iran’s permanent representative to the UN, addressed to the Secretary-General and the President of the Security Council. Iravani emphasized that Iran is prepared to exercise its inherent right to self-defense under Article 51 of the UN Charter, promising a decisive and proportionate response to any military aggression.

Iravani further warned that in such a scenario, all bases, facilities, and assets belonging to hostile forces in the Middle East would constitute legitimate targets for Iranian defensive measures. The envoy added that the United States would bear full and direct responsibility for any unforeseen and uncontrollable consequences resulting from further provocations.