UNITED NATIONS -- United Nations (UN) Secretary-General Antonio Guterres on Saturday condemned the military escalation in the Middle East, saying that the use of force by the United States and Israel against Iran, and the subsequent retaliation by Iran across the region, undermine international peace and security.

"All Member States must respect their obligations under international law, including the Charter of the United Nations," which clearly prohibits "the threat of the use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations," Guterres said in a statement.

The UN chief called for an immediate cessation of hostilities and de-escalation, warning that failing to do so risks a wider regional conflict with grave consequences for civilians and regional stability.

"I strongly encourage all parties to return immediately to the negotiating table," he said.

Stressing that the UN Charter provides the foundation for maintaining international peace and security, Guterres reiterated that there is no viable alternative to the peaceful settlement of international disputes, in full accordance with international law, including the UN Charter.