Sweden's accession is intended to bolster Baltic deterrence; whether enlargement reduces or raises conflict risk is disputed, so the effect is coded neutral and flagged for review.

Sweden formally joined NATO on 7 March 2024 as the alliance's 32nd member, ending more than two centuries of military neutrality, after nearly two years of negotiations to overcome objections from Turkey and Hungary. Sweden deposited its instrument of accession with the United States, and Secretary of State Antony Blinken received the documents in Washington alongside Swedish Prime Minister Ulf Kristersson. As with Finland, supporters cite enhanced deterrence while critics warn of heightened tensions with Russia, leaving the net security effect contested.
Sweden formally joined NATO on 7 March 2024 as the alliance's 32nd member, ending more than two centuries of military neutrality, after nearly two years of negotiations to overcome objections from Turkey and Hungary. Sweden deposited its instrument of accession with the United States, and Secretary of State Antony Blinken received the documents in Washington alongside Swedish Prime Minister Ulf Kristersson. As with Finland, supporters cite enhanced deterrence while critics warn of heightened tensions with Russia, leaving the net security effect contested.
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Sweden's accession is intended to bolster Baltic deterrence; whether enlargement reduces or raises conflict risk is disputed, so the effect is coded neutral and flagged for review.