Several key U.S. allies on Sunday called for renewed diplomacy after American strikes on Iran raised fears of broader conflict, while regional players – including Tehran's backers – condemned the attacks but also urged deescalation.
U.S. President Donald Trump had said Thursday that he would decide within two weeks whether to get involved in Israel's war with Tehran. In the end, it took just days. Washington hit three Iranian nuclear sites early Sunday.
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 scattered across the Gulf region.
U.N. Secretary-General Antonio Guterres said he was "gravely alarmed" by the use of force by the United States.
"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 in a statement on the social media platform X. "I call on Member States to de-escalate."
"There is no military solution. The only path forward is diplomacy."
British Prime Minister Keir Starmer called for Iran to return to the negotiating table to diplomatically end the crisis, saying stability was the priority in the volatile region.
The U.K., along with the European Union, France and Germany, tried unsuccessfully to broker a diplomatic solution in Geneva last week with Iran.
Starmer said Iran's nuclear program posed a grave threat to global security.
"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 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 "a gross violation of international law, the U.N. Charter, and U.N. Security Council resolutions."
The Iraqi government condemned the U.S. strikes, saying the military escalation created a grave threat to peace and security in the Middle East. It said it poses serious risks to regional stability and called for diplomatic efforts to deescalate the crisis.
"The continuation of such attacks risks dangerous escalation with consequences that extend beyond the borders of any single state, threatening the security of the entire region and the world," government spokesman Bassem al-Awadi said in the statement.
Saudi Arabia 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, deescalate tensions, and avoid further escalation," the Foreign Ministry said in a statement.
Saudi Arabia had earlier condemned Israel's strikes on Iran's nuclear facilities and military leaders.
Qatar, which is home to the largest U.S. military base in the Middle East, said it "regrets" escalating tensions in the Israel-Iran war.
Its Foreign Ministry in a statement urged all parties to show restraint and "avoid escalation, which the peoples of the region, burdened by conflicts and their tragic humanitarian repercussions, cannot tolerate."
Qatar has served as a key mediator in the Israel-Hamas war.
Both the Houthi rebels in Yemen and Hamas have condemned the U.S. strikes.
In a statement Sunday, the Houthi political bureau called on Muslim nations to join "the Jihad and resistance option as one front against the Zionist-American arrogance."
Hamas and the Houthis are part of Iran's so-called Axis of Resistance, a collection of pro-Iranian proxies stretching from Yemen to Lebanon that for years gave the Islamic Republic considerable power across the region.
Lebanese President Joseph Aoun said the U.S. bombing could lead to a regional conflict that no country could bear and called for negotiations.
"Lebanon, its leadership, parties, and people, are aware today, more than ever before, that it has paid a heavy price for the wars that erupted on its land and in the region," Aoun said in a statement on X. "It is unwilling to pay more."
Pakistan blasted the U.S. strikes as a "deeply disturbing" escalation just days after it nominated Trump for the Nobel Peace Prize for his diplomatic intervention in the India-Pakistan crisis.
"These attacks violate all norms of international law," the government said in a statement. "Iran has the legitimate right to defend itself under the U.N. Charter."
China condemned U.S. strikes on Iran, calling them a serious violation of international law that further inflamed tensions in the Middle East.
In a statement, the Chinese Foreign Ministry urged all parties, especially Israel, to implement a cease-fire and begin dialogue.
"China is willing to work with the international community to pool efforts together and uphold justice, and contribute to the work for restoring peace and stability in the Middle East," the ministry said.
The European Union's top diplomat said Iran must not be allowed to develop a nuclear weapon, but she urged those involved in the conflict to show restraint.
"I urge all sides to step back, return to the negotiating table and prevent further escalation," EU foreign policy chief Kaja Kallas said in a post on social media.
Foreign Minister Antonio Tajani said Iran's nuclear facilities "represented a danger for the entire area" but hoped the action could lead to deescalation in the conflict and negotiations.
President Antonio Costa said he was "deeply alarmed" by the bombings and called on all parties to "show restraint and respect for international law and nuclear safety."
"Too many civilians will once again be the victims of a further escalation," Costa added. "The EU will continue engaging with the parties and our partners to find a peaceful solution at the negotiating table."
Dutch Foreign Minister Caspar Veldkamp, whose country is hosting a summit of NATO leaders, including Trump, on Tuesday and Wednesday, said the government's national security council would meet later to discuss the issue.
He said the U.S. attacks amounted to "a further escalation of a worrying situation in the Middle East."
Japanese Prime Minister Shigeru Ishiba told reporters Sunday that it was crucial to calm the situation as soon as possible, adding that the Iranian nuclear weapons development also must be prevented.
Ishiba, asked if he supports the U.S. attacks on Iran, declined to comment.
Pope Leo XIV made a strong appeal for peace during his Sunday Angelus prayer in St. Peter's Square, calling for international diplomacy to "silence the weapons."
After an open reference to the "alarming" situation in Iran, the first American pontiff stressed that "today more than ever, humanity cries out and invokes peace and it is a cry that demands reason and must not be stifled."
Pope Leo urged every member of the international community to take up their moral responsibility to "stop the tragedy of war before it becomes an irreparable abyss."
