Sweden officially joined North Atlantic Treaty Organization (NATO) on 7 March 2024, becoming the 32nd member of the military alliance. This historic move ended Sweden’s over 200-year policy of military non-alignment, which had been in place since the Napoleonic Wars.
Sweden formally completed the process by depositing its instrument of accession in Washington, D.C., thereby gaining the protection of NATO’s collective defense clause, Article 5, which states that an attack on one member is considered an attack on all members.
Founded on 4 April 1949, NATO is a military alliance headquartered in Brussels, Belgium, aimed at ensuring collective security among its member states. With Sweden’s accession, the alliance now includes 32 countries.
Sweden brings advanced armed forces, strong defense industries, and strategic expertise in the Arctic and Baltic regions, strengthening NATO’s northern flank. However, the expansion has also increased tensions with Russia, which has opposed NATO’s enlargement.
Overall, Sweden’s membership marks a major shift in European security policy and reinforces NATO’s position as the largest military alliance in the world.
