The verdict of U.S. voters was more decisive than most pollsters and pundits had predicted. Now the world waits to see whether the election of Donald Trump as president for a second time will prove as destabilizing as many American allies fear.

Trump secured victory Wednesday when he surpassed the 270 electoral college votes needed to win. In a victory speech before the official declaration, he vowed to “put our country first” and bring about a “golden age” for America.

Trump’s first term saw him insult and alienate many of the United States’ longstanding allies. His return to the White House, four years after losing office to President Joe Biden, has huge consequences for everything from global trade to climate change to multiple crises and conflicts around the world.

Trump has pledged to ramp up a tariff feud with China, the United States’ growing economic and strategic rival. In the Middle East, Trump has pledged, without saying how, to end the conflicts between Israel, Hamas and Hezbollah. He has also vowed to end the Russia-Ukraine war within 24 hours of taking office – something Ukraine and its supporters fear would be on terms favorable to Moscow.

Here’s how leaders and others around the world are reacting:

NATO is nervous and Ukraine is anxious

NATO Secretary-General Mark Rutte congratulated Trump, saying, “I look forward to working with him again to advance peace through strength through NATO” in the face of “a growing number of challenges globally,” including “the increasing alignment of China, Russia, North Korea and Iran.”

Trump was a strong critic of the North Atlantic military alliance during his first term, accusing its other members of failing to pull their weight. Earlier this year he said the United States would not defend NATO members that don’t meet defense spending targets.

Rutte emphasized the positive, praising Trump for his work persuading member states to ramp up defense spending and saying NATO was now “stronger, larger, and more united.”

America’s allies are — belatedly, some say — grappling with what to do if they cannot depend on the U.S. for their defense.

“The existential concern for Europeans has been what happens to Ukraine, what happens to Europe’s security, what happens to America’s commitment to NATO?” said Leslie Vinjamuri, director of the U.S. and Americas program at the think tank Chatham House. “Will America be there for Europe?”

The U.S. is by far Kyiv’s biggest military backer as it battles Russian invasion, though the Biden administration resisted pressure from President Volodymyr Zelenskyy to do even more. Zelenskyy, like Rutte, said he welcomed Trump’s “peace through strength” approach.

“This is exactly the principle that can practically bring just peace in Ukraine closer,” Zelenskyy wrote on social media. “I am hopeful that we will put it into action together. We look forward to an era of a strong United States of America under President Trump’s decisive leadership.”

No congratulations were forthcoming from Moscow, where President Vladimir Putin’s spokesman, Dmitry Peskov, declared that Russia-U.S. relations were at the “lowest point in history.”

European congratulations mask deep divisions

European leaders rushed to congratulate Trump even before his victory was officially declared — some more effusively than others.

British Prime Minister Keir Starmer called it a “historic election victory” and said that “as the closest of allies, the U.K. and U.S. will continue to work together to protect our shared values of freedom and democracy.”

Like governments of U.S. allies around the world, Starmer’s center-left administration has worked hard to forge ties with Trump and his team. Starmer had dinner with Trump at Trump Tower in September.

France’s centrist President Emmanuel Macron offered congratulations, “respect and ambition.” Social Democratic German Chancellor Olaf Scholz congratulated Trump and said he wanted continued close ties, even if “surely many things will be different under a Donald Trump-led administration.”

Italian Premier Giorgia Meloni, whose far right-led government is in some ways close to Trump politically, said Italy and the U.S. had a “strategic bond, which I am sure we will now strengthen even more.”

European leaders are keen to stress that the transatlantic relationship transcends individual politicians, but Trump’s protectionist economic leanings are causing concern. During his last term he slapped tariffs on European steel and aluminum, roiling the bloc’s economy.

European Commission President Ursula von der Leyen stressed that the EU and the U.S. "are bound by a true partnership between our people, uniting 800 million citizens. Let us work together on a transatlantic partnership that continues to deliver for our citizens.”

Europe’s populist politicians, meanwhile, welcomed the victory of a politician they consider a kindred spirit.

“They threatened him with prison, they took his property, they wanted to kill him ... and he still won,” said Hungary’s nationalist Prime Minister Viktor Orbán, who will hold a summit in Budapest for some 50 European leaders on Thursday.

A Middle East in turmoil awaits Trump’s moves

During his first term, Trump pushed to remake the Middle East by reconciling Israel and Saudi Arabia, and all eyes now are on how he intervenes in the region’s raging conflicts between Israel and Hamas in Gaza and Israel and Hezbollah in Lebanon — and the chief backer of the two militant groups, Iran.

Israeli Prime Minister Benjamin Netanyahu called Trump’s election win “history’s greatest comeback.”

“Your historic return to the White House offers a new beginning for America and a powerful recommitment to the great alliance between Israel and America. This is a huge victory!” he wrote on social media.

Trump and Netanyahu — a fellow conservative nationalist — had a tight relationship during the former president’s first term, but the ties soured when Netanyahu congratulated President Joe Biden on winning in 2020.

Netanyahu’s inner circle hopes Trump will allow Israel free rein against its enemies, but the president-elect is famously unpredictable, and the Israeli leader faces strong opposition at home. On Tuesday he fired popular Defense Minister Yoav Gallant, a surprise announcement that sparked protests across the country.

Hamas issued a terse statement saying, “Our position on the new U.S. administration depends on its positions and practical behavior towards our Palestinian people, their legitimate rights and their just cause.”

Washington is one of the key mediators of so-far unsuccessful Gaza cease-fire talks and has publicly accused Hamas of turning down several deals. Hamas has denied this, blaming Israel for demanding last-minute changes to the proposals.

The challenge of China still looms

The Chinese government said its approach to the U.S. was unchanged by Trump's victory.

“We will continue to view and handle China-U.S. relations in accordance with the principles of mutual respect, peaceful coexistence and cooperation for win-win," said foreign ministry spokeswoman Mao Ning.

But analysts in China were pessimistic, citing the likelihood of escalating tariffs and an intensifying confrontation over Taiwan.

“It is not all dark, but there are more challenges than opportunities,” said Da Wei, director of the Center for International Security and Strategy at Tsinghua University in Beijing. “We are clear about the challenges. As for opportunities, we are yet to see them clearly.”

Long-seething territorial disputes in the South China Sea are a fault line in the U.S.-China rivalry in Asia and likely will remain a major foreign policy concern for the next American president.

Phillips O’Brien, professor of strategic studies at the University of St. Andrews, said Washington's allies in the Indo-Pacific, including Japan, South Korea, Taiwan and even Australia, “can no longer look for the U.S.A. to be a reliable partner in defense.”

Asian leaders apprehensive about China’s growing clout and North Korea's nuclear program, clamored for Trump’s attention in congratulatory messages.

“I hope to closely cooperate with President-elect Trump to further elevate Japan-U.S. alliance and relations to even higher levels,” Japanese Prime Minister Shigeru Ishiba said. South Korean President Yoon Suk Yeol said the Korea-U.S. alliance “will shine brighter,” under Trump's ”strong leadership."

Neighbors hope for good relations

The United States’ neighbors in the Americas, some of whom bore the impact of Trump's protectionist instincts during his first term, also braced for uncertainty.

Mexico’s President Claudia Sheinbaum told Mexicans “there is no reason to worry,” despite Trump’s previous threats to impose trade tariffs on Mexican products unless the country does more to stem the flow of migrants and drugs to the U.S.

Canadian Prime Minister Justin Trudeau — previously derided by Trump as “weak” and “dishonest” — wrote on X: “The friendship between Canada and the U.S. is the envy of the world. I know President Trump and I will work together to create more opportunity, prosperity, and security for both of our nations.”