WASHINGTON (AP) — Sweden on Thursday formally joined NATO as the 32nd member of the transatlantic military alliance, ending decades of post-World War II neutrality and centuries of broader non-alignment with major powers as security concerns in Europe have spiked following Russia’s 2022 invasion of Ukraine.

President Joe Biden congratulated Sweden on its admission and said it was a sign that Russian President Vladimir Putin’s intervention in Ukraine had united, rather than divided, the alliance.

“When Putin launched his brutal war of aggression against the people of Ukraine, he thought he could weaken Europe and divide NATO,” Biden said in a statement, which he is expected to echo in his State of the Union address to Congress later Thursday.

“Instead, in May 2022, Sweden and Finland — two of our close partners, with two highly capable militaries — made the historic decision to apply for full NATO membership,” Biden said. ”With the addition of Sweden today, NATO stands more united, determined, and dynamic than ever—now 32 nations strong.”

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AP AUDIO: Sweden officially joins NATO, ending decades of post-World War II neutrality.

At a ceremony, U.S. Secretary of State Antony Blinken accepts the “instrument of accession” as Sweden formally joins the NATO alliance.

Swedish Prime Minister Ulf Kristersson and Secretary of State Antony Blinken presided at a ceremony in which Sweden’s “instrument of accession” to the alliance was officially deposited at the State Department.

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