The Finnish government (Valtioneuvosto) has initiated a formal review of its Nuclear Energy Act (Ydinenergialaki) to determine whether the country should lift its long-standing ban on the transit of nuclear weapons. This legislative debate has intensified following French President Emmanuel Macron’s recent announcement to expand France’s nuclear stockpile and offer a “forward deterrence” model to European allies. As a member of NATO, Finland is reassessing its legal framework to align with the alliance’s collective defense strategies while navigating significant domestic political sensitivity.
The current legal framework in Helsinki
Under the current Nuclear Energy Act (Ydinenergialaki), which has been in force for over 35 years, the import, manufacture, possession, and detonation of nuclear explosives are strictly prohibited on Finnish soil. This includes the transit of such weapons through Finnish territorial waters or airspace. However, the Ministry of Economic Affairs and Employment (Työ- ja elinkeinoministeriö) is now overseeing an extensive reform of the act, intended to enter into force by January 2027.
While the primary goal of the reform is to streamline regulation for nuclear energy and small modular reactors (SMR), the geopolitical shift caused by the invasion of Ukraine by Russia has forced a re-evaluation of the “nuclear clauses.” Proponents of the change argue that the ban is a relic of the era of military non-alignment and could hinder NATO’s operational flexibility in the High North.
The impact of the French ‘forward deterrence’
The debate in Finland gained new momentum after French President Emmanuel Macron’s speech at the Île Longue naval base in early March 2026. Macron outlined a shift in French doctrine, moving toward a “forward deterrence” that includes increasing the number of warheads and inviting European partners to participate in nuclear deterrence exercises.
France, one of the three nuclear-armed states in NATO, has proposed that allied countries could host temporary deployments of nuclear-capable aircraft, such as the Rafale. While countries like Poland and Germany have shown openness to deeper coordination, Finland’s participation is currently blocked by its own domestic laws. Lifting the transit ban would allow nuclear-capable assets from the USA, France, or the UK to move through Finnish territory during exercises or in response to regional threats.
Strategic alignment and NATO obligations
President Alexander Stubb has previously signaled that NATO membership should be “full and without conditions,” suggesting that the Finnish defense posture must include the alliance’s nuclear umbrella. Stubb has clarified that the transit of weapons is legally and strategically distinct from the permanent stationing of warheads, which remains a red line for most of the Finnish public and political spectrum.
Finland has already begun participating in NATO‘s annual nuclear deterrence exercise, “Steadfast Noon,” in a supporting non-nuclear role. Analysts suggest that removing the transit restriction would be a symbolic and practical step to demonstrate Finland’s commitment to the alliance’s “supreme guarantee” of security.
Public opinion and political hurdles
Despite the government’s pragmatic approach, public opinion remains cautious. Recent polls indicate that while a majority of Finns support NATO membership, over 60 percent remain opposed to the transit of nuclear weapons through the country. Critics of the reform, including members of the Social Democratic Party (Suomen Sosialidemokraattinen Puolue), argue that maintaining a nuclear-free status in peacetime is essential for regional stability and arms control efforts.
The Ministry of Defence (Puolustusministeriö) is expected to provide further clarity on the military implications of the transit ban later this year. The final decision will require a delicate balance between fulfilling NATO expectations and respecting a national identity long rooted in nuclear non-proliferation.
