On December 5, 2023, Finland announced a significant shift in its defense policy, allowing the presence of nuclear weapons on its territory. This decision comes in light of the deteriorating security situation in Europe following Russia's full-scale invasion of Ukraine in 2022. Finnish Defense Minister Antti Hakkanen stated that the need for such a policy change is driven by the fundamental worsening of security in both Finland and the broader European region. Additionally, necessary legal amendments are expected to be initiated soon to facilitate this new policy.

Historically, Finland maintained a policy of military non-alignment, but the invasion of Ukraine prompted a reevaluation of its defense strategies, leading to its accession to NATO in 2023. By permitting the storage of nuclear weapons, Finland aims to enhance the deterrent effect of NATO in the region, underscoring its commitment to collective security in the face of Russian aggression. Finland shares a lengthy border exceeding 1,300 kilometers with Russia, amplifying the perceived need for enhanced security measures.

Furthermore, Finland has notified the United Nations of its intention to withdraw from the Ottawa Treaty, which bans anti-personnel landmines, further signaling its shift towards a more active and aggressive defense posture. The implications of this policy change could reshape the security dynamics in Northern Europe, as it reflects a broader trend among NATO allies to bolster their defenses in response to increasing threats from Russia, especially following its recent military actions in Ukraine.