Finland lifts ban on nuclear weapons under new defence law

Finland has passed legislation removing a long-standing ban on nuclear weapons, in a move that broadens what the country can legally allow on its territory for national defence. The change means nuclear arms can now be imported, transported, supplied and possessed under Finnish law. The government has said Finland will not host any nuclear weapons at present.

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The legislation replaces restrictions linked to the 1987 Nuclear Energy Act, which had prohibited nuclear weapons on Finnish soil. Defence Minister Antti Häkkänen said the earlier law created an awkward situation for Finland, which became a NATO member in April 2023. The new rules were passed against what the government described as an unpredictable security environment.

The decision comes as Finland faces heightened concern over Russia, which has increased military activity near the border in recent years. The supporting material says Russia began construction last week on a new military base close to Finland's eastern border, with aerial images showing new barracks under construction after work began in late 2025. The same material says the base could accommodate between 4,000 and 6,000 personnel, according to a former Finnish intelligence officer.

The change is significant because it affects how Finland could fit into NATO's wider nuclear deterrence posture. NATO relies on collective defence arrangements that include nuclear planning and deterrence, and the new Finnish law removes a domestic legal barrier that had limited options in that area. While the government says there is no current plan to host nuclear weapons, the legal shift gives Finland more flexibility in a crisis or in alliance planning.

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Finland's security debate has been shaped by its long border with Russia and by recent tensions over border management. The supporting material says Finland shares an 830-mile border with Russia and has erected a 10-foot fence topped with barbed wire along much of it to stop illegal crossings. It also says the eastern side of the border was closed after attempts by Russia to send an influx of refugees into the country.

Those developments have reinforced concern in Helsinki about pressure from Moscow. What remains unclear is whether the new law will lead to any practical change in NATO deployments or planning. The government has not said it intends to host nuclear weapons, and no timeline has been given for any further steps.

The key issue to watch is whether the legal change is followed by any shift in Finland's defence posture or in Russia's response along the border.

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