Finland and Sweden's accession to NATO is a historic shift, the product of Russian aggression and the collapse of assumptions that shaped European security for decades. It is also a reminder that alliances matter, that geography and history shape strategy, and that actions have consequences. Putin wanted to stop NATO expansion; instead, he accelerated it. NATO was written off as obsolete; instead, it has found new purpose. And two countries that prized neutrality for generations have chosen collective defence, not because they wanted to, but because Russia left them no choice.
Key takeaways
- Finland joined NATO in April 2023 and Sweden in March 2024, ending decades of military non-alignment and doubling NATO's border with Russia
- Both countries were driven to seek membership by Russia's invasion of Ukraine, which shattered assumptions about European security and Russian intentions
- Finland brings significant military capability including a 280,000-strong wartime army and expertise in defending against Russia, whilst Sweden adds advanced submarines and fighter aircraft
- Russia threatened consequences but has been unable to prevent the expansion, exposing the limits of its influence and the failure of its Ukraine strategy
- NATO now controls the Baltic Sea and has a continuous defensive line from the Arctic to the Black Sea, dramatically improving its strategic position in Northern Europe
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