International defence cooperation
In this section
The Ministry's other areas of expertise
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Finland’s membership in NATO
Finland’s security environment was fundamentally altered when Russia launched its invasion of Ukraine in February 2022. Based on a reassessment of the security policy situation, Finland decided to apply for NATO membership in May 2022, and it became a full member in April 2023.
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Territorial surveillance
In matters pertaining to the Territorial Surveillance Act, the Ministry of Defence is the highest authorising body.