Several close U.S. allies urged a return to the negotiating table in the wake of U.S. strikes on Iran that fueled fears of a wider conflict, while noting the threat posed by Tehran’s nuclear program. Some countries and groups in the region, including those that support Iran, condemned the move while also urging de-escalation.

U.S. President Donald Trump had the military hit three Iranian nuclear sites early Sunday local time.

While the amount of damage remained unclear, Iranian Foreign Minister Abbas Araghchi said the U.S. had “crossed a very big red line,” the time for diplomacy was over and Iran had the right to defend itself.

Some have questioned whether a weakened Iran would capitulate or remain defiant and begin striking with allies at U.S. targets across the Gulf region.

Here is a look at reactions from governments and officials around the world.

U.N. Secretary-General António Guterres said he was “gravely alarmed” by the use of force by the U.S.

“There is a growing risk that this conflict could rapidly get out of control — with catastrophic consequences for civilians, the region, and the world,” he said on X. “The only path forward is diplomacy.”

British Prime Minister Keir Starmer warned of escalation beyond the Middle East as he called for all sides to negotiate a diplomatic end to the crisis, saying stability was the priority in the region.

The U.K., with the European Union, France and Germany, tried unsuccessfully to broker a diplomatic solution in Geneva last week with Iran. “Iran can never be allowed to develop a nuclear weapon and the U.S. has taken action to alleviate that threat,” Starmer said.

Dmitry Medvedev, who serves as deputy head of Russian President Vladimir Putin’s Security Council, said several countries were prepared to supply Tehran with nuclear weapons.

He didn’t specify which countries but said the U.S. attack caused minimal damage and would not stop Tehran from pursuing nuclear weapons.

Russia’s Foreign Ministry said it “strongly condemned” the airstrikes and called them “a gross violation of international law, the U.N. Charter, and U.N. Security Council resolutions.”

Saudi Arabia, which previously condemned Israel’s strikes on Iran’s nuclear facilities and military leaders, expressed “deep concern” about the U.S. airstrikes, but stopped short of condemning them.

“The Kingdom underscores the need to exert all possible efforts to exercise restraint, de-escalate tensions, and avoid further escalation,” the Foreign Ministry said.