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President Joe Biden is greeted by NATO Secretary-General Jens Stoltenberg at the NATO summit. Photo: Patrick Semansky/Pool/AFP via Getty Images

President Biden reaffirmed the United States' commitment to NATO during a sit-down with Secretary-General Jens Stoltenberg, the president's first meeting at NATO's 2021 summit in Brussels.

Why it matters: Biden has used his first international trip as president to reassure allies that his administration is committed to multilateralism and to NATO's Article 5, which stipulates that the entire alliance will respond to an attack on any member nation.

  • "Article 5 we take as a sacred obligation,” Biden told Stoltenberg. "I want NATO to know America is there."

The big picture: The summit is Biden's first with NATO following the presidency of Donald Trump, who famously called the alliance "obsolete" and routinely attacked member states for not living up to their defense spending commitments.

  • Trump also expressed skepticism about Article 5, once calling member state Montenegro "very aggressive" and suggesting the U.S. would not come to the tiny country's defense in the event of a conflict with Russia.
  • "I want to make it clear, NATO is critically important for U.S. interests in and of itself," Biden said at his meeting with Stoltenberg. "If there weren't one, we would have to invent one."

The state of play: White House national security adviser Jake Sullivan told reporters aboard Air Force One on Sunday that Biden plans to discuss the ongoing withdrawal from Afghanistan with NATO allies, as well as the "increasingly important" issues of cybersecurity and defense.

  • Biden is also expected to push NATO member states to take a harder line against China, which historically has not been part of the alliance's mandate.
  • The U.S. president could meet some resistance on this front: “We are not entering a new cold war with China, and China is not our adversary, our enemy,” Stoltenberg said before meeting with Biden.

What to watch: Biden on Monday also met with the prime minister of Estonia and the presidents of Latvia and Lithuania. He's scheduled to meet with Turkish President Recep Tayyip Erdoğan, who has called for easing tensions between his country and the U.S. at the summit.

In photos
President Biden and other NATO heads of the states and governments pose for a family photo during the NATO summit. Photo: Kevin Lamarque/POOL/AFP via Getty Images
Biden greets Turkish President Recep Tayyip Erdoğan. Photo: Olivier Matthys/POOL/AFP via Getty Images
French President Emmanuel Macron speaking with Biden. Photo: Dursun Aydemir/Anadolu Agency via Getty Images
Biden with NATO Secretary General Jens Stoltenberg. Photo: Stephanie Lecocq/POOL/AFP via Getty Images

Go deeper ... Biden's European pick-up line: I am not Trump

Go deeper

Biden claims "era of relentless war" is over in first UN speech

Photo: Eduardo Munoz/Pool/AFP via Getty Images

Addressing the UN General Assembly for the first time since taking office, President Biden laid out his vision for how the U.S. will confront what he characterized as a "decisive" next decade in human history.

Why it matters: In the face of unprecedented global challenges — the pandemic, climate change, rising authoritarianism — Biden made a case for multilateralism, democratic values, the rule of law and empathy for common struggles.

Biden's communication headaches

President Biden stands with British Prime Minister Boris Johnson and French President Emmanuel Macron at the G7 summit in June. Photo: Patrick Semansky/Pool/AFP via Getty Images

Boris Johnson told reporters on his way to the U.N. General Assembly on Sunday night he didn't believe it was likely that the U.S. would agree to lift its ban on vaccinated foreign travelers this week. Hours later, the White House did exactly that.

Why it matters: For the second time in less than a week, a major U.S. foreign policy decision by the Biden administration appears to have caught one of its closest allies by surprise. And neither was the first time, either.

Sep 21, 2021 - Politics & Policy

Inside the UN's fraught climate huddle

UN Secretary-General Antonio Guterres addresses the media at the Informal Leaders Roundtable on Climate Action at UN Headquarters. Photo: Lev Radin/Pacific Press/LightRocket via Getty Images

A closed-door, head-of-state level meeting at the United Nations Monday with nearly two-dozen leaders and emissaries showcased the rifts between countries on core climate policy issues.

Why it matters: These gaps must be narrowed during the next few weeks in order to avert a failed U.N. Climate Summit in Glasgow.