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Timeline of NATO [trans-Atlantic alliance] expansion since 1949

Finland and Sweden are nearing decisions on whether to ditch their long-standing policy of military nonalignment and join NATO in the wake of Russia's invasion of Ukraine.

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Timeline of NATO [trans-Atlantic alliance] expansion since 1949

2017: Montenegro joins NATO.

2020: North Macedonia becomes NATO's 30th member.

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Timeline of NATO [trans-Atlantic alliance] expansion since 1949

2022: Sweden and Finland explore the possibility of NATO membership after Russia's invasion of Ukraine.