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          S   Congressional                                                       ____
            'aResearch Service






NATO Enlargement to Sweden and Finland



Updated March 22, 2024

Sweden  joined NATO on March 7, 2024, enlarging the alliance to 32 members (see Figure 1). Amid
heightened security concerns about Russia after its February 2022 invasion of Ukraine, both Finland and
Sweden  applied to join NATO in May 2022 with the intention to accede to the alliance together. Finland
joined on April 4, 2023, but Sweden's accession was delayed by issues raised by Turkey (Turkiye) and
Hungary. The Biden Administration and majorities in the House and Senate expressed support for NATO
enlargement to both Finland and Sweden, viewing the addition of these two mature democracies with
capable militaries as enhancing Euro-Atlantic security and advancing U.S. interests.

Finland and Sweden Apply for NATO Membership

Finland's and Sweden's applications to NATO marked a historic shift for these traditionally militarily
nonaligned countries that for decades sought to balance political, economic, and cultural ties to the West
and relations with Russia. After the Cold War, Finland and Sweden joined the European Union (EU) and
established close partnerships with NATO. Both Finland and Sweden have participated in numerous
NATO   operations over the years, and the two countries have advanced militaries that are interoperable
with NATO.  Public support for NATO membership-and the added security of NATO's Article 5
mutual defense clause-skyrocketed in both countries following Russia's invasion of Ukraine; polls
indicate support at 82% in Finland (as of November 2023) and 60% in Sweden (as of March 2024).
U.S. officials from the Departments of State and Defense concurred with Finnish and Swedish assertions
that the two countries would strengthen NATO's defense posture, especially in the Baltic Sea region.
Finland spends nearly 2.5% of its GDP on defense (above NATO's 2% spending guideline). Sweden
intends to meet NATO's 2% defense spending goal in 2024.
Some  analysts expressed concern about NATO's ability to defend Finland's 830-mile border with Russia
(which doubles NATO's overall borders with Russia). Finnish officials contend that Finland has long
defended its own borders and will continue to do so as a NATO member. Finland and Sweden also have
strong traditions of societal resilience and experience dealing with Russian disinformation efforts,
cyberattacks, and hybrid threats. Russia has largely sought to downplay concerns about Finnish and
Swedish accession to NATO, but Russian President Vladimir Putin has warned NATO against deploying
troops or expanding military infrastructure in either country. In the period before Finland's and Sweden's
accession, the United States and NATO enhanced defense cooperation and conducted more joint training
exercises with Finland and Sweden, in part to provide security reassurances to both countries.

                                                                Congressional Research Service
                                                                  https://crsreports.congress.gov
                                                                                      IN11949

CRS INSIGHT
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