The U.N. Security Council will meet on Saturday after the United States and Israel launched strikes on Iran, plunging the Middle East into a new conflict.

U.N. diplomats said the 15-member body would meet at 4 p.m. local time in New York. The meeting will be chaired by the United Kingdom, which holds the monthly council presidency.

Russia's U.N. mission said Russia and China requested an emergency meeting "in connection with the unprovoked act of armed aggression by the United States and Israel against the Islamic Republic of Iran."

It said the meeting was also called for by France, Bahrain, and Colombia.

"During the Security Council meeting, we will demand from the United States and Israel to immediately cease their illegal and escalatory actions and embark on a path toward a political and diplomatic settlement," the Russian statement said.

A U.N. diplomat said U.N. Secretary-General Antonio Guterres plans to speak at the Security Council session.

Earlier on Saturday, Guterres issued a statement condemning military escalation in the Middle East and 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."

"I call for an immediate cessation of hostilities and de-escalation. 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," Guterres said.