Nations around the world reacted swiftly and intensely on Sunday after the United States carried out airstrikes on three Iranian nuclear facilities, dramatically escalating its involvement in Israel’s ongoing conflict with Tehran. While close U.S. allies acknowledged the threat posed by Iran’s nuclear program, many expressed grave concern over the risk of a wider war and called urgently for diplomacy to prevent further bloodshed.
The U.S. strikes, ordered by President Donald Trump just days after stating he would take two weeks to decide, targeted Iran’s Fordo, Natanz, and Isfahan sites—locations central to the country’s uranium enrichment program. Trump claimed the sites were “completely and fully obliterated” and warned Iran against retaliation. Iran, however, declared that it would “resist with full force,” accusing the U.S. of crossing a “very big red line.”
UN Secretary-General António Guterres said he was “gravely alarmed,” warning that the conflict risked spiraling out of control with “catastrophic consequences” for civilians and the broader region. “There is no military solution. The only path forward is diplomacy,” Guterres said in a statement on X.
British Prime Minister Keir Starmer called for Iran to return to talks while stressing that its nuclear ambitions remain a serious global threat. “Iran can never be allowed to develop a nuclear weapon, and the U.S. has taken action to alleviate that threat,” Starmer said.
Other Western allies echoed this balancing act—acknowledging Iran’s nuclear risks but urging restraint. The European Union’s foreign policy chief, Kaja Kallas, urged all parties to “step back, return to the negotiating table and prevent further escalation,” while European Council President Antonio Costa warned that “too many civilians will once again be the victims.”
Russia strongly condemned the U.S. airstrikes, labeling them a “gross violation of international law.” Dmitry Medvedev, deputy head of President Putin’s Security Council, went further, suggesting that some countries may now be prepared to arm Iran with nuclear weapons—though he did not name them.
Middle Eastern reactions were sharp. Iraq condemned the U.S. action as a grave threat to regional peace, while Saudi Arabia expressed “deep concern” and urged all sides to avoid further escalation. Qatar, which hosts the largest U.S. military base in the region, called on all parties to show restraint, noting the region’s people “cannot tolerate” more war.
Iran-aligned factions were more direct in their criticism. The Houthis in Yemen called on Muslim nations to unite against what they termed “Zionist-American arrogance,” while Hamas echoed the condemnation. Lebanon’s President Joseph Aoun warned that the U.S. strikes could spark a regional war “no country could bear,” reflecting Lebanon’s long, painful history with regional conflict.
Pakistan, which only days earlier had nominated Trump for a Nobel Peace Prize for easing tensions with India, called the strikes a “deeply disturbing” violation of international law. “Iran has the legitimate right to defend itself under the UN Charter,” Pakistan said.
China also condemned the strikes, urging Israel and Iran to agree to a ceasefire and resume dialogue. “China stands ready to work with the international community to restore peace and stability in the Middle East,” its Foreign Ministry stated.
Japan, while declining to endorse the strikes, said it was “crucial to calm the situation as soon as possible” and reiterated that Iran’s nuclear program must be restrained.
Even the Vatican entered the conversation, with Pope Leo XIV making an impassioned plea during his Sunday Angelus prayer. “Today more than ever, humanity cries out and invokes peace—and it is a cry that demands reason and must not be stifled,” the Pope said. He urged world leaders to silence weapons and return to dialogue.
As tensions mount, uncertainty looms over whether this military escalation is the beginning of a broader regional war or a calculated show of force aimed at compelling Tehran back to the table. With Iran vowing resistance and global calls for diplomacy growing louder, the world watches anxiously for what comes next.