Lithuania Advances Constitutional Amendment to Lift Ban on Nuclear Weapons

Lithuanian defense officials argue that legally barring allied nuclear weapons from their territory leaves a critical gap in NATO's eastern deterrence architecture. Russian leadership counters that moving nuclear infrastructure closer to its borders crosses a red line that will force immediate military countermeasures.[1][4]

The Lithuanian Seimas advanced a constitutional amendment on October 6, 2026, to eliminate the country's ban on hosting weapons of mass destruction. The measure passed its first reading with 106 lawmakers in favor, 18 opposed, and six abstaining.[1][4][6]

The legislation targets Article 137 of the Lithuanian Constitution, which currently prohibits both weapons of mass destruction and foreign military bases. Removing the restriction requires two parliamentary votes separated by at least three months.[1][4]

Parliament Speaker Juozas Olekas scheduled the second and final ballot for January 12, 2027. To take effect and alter the national charter, the amendment will need the support of at least 94 of the 141 lawmakers during that winter session.[1][4][6]

Deterrence and legal parity

Proponents of the change view it as a necessary alignment with broader European security frameworks. The current constitutional language strictly prevents allied aircraft or naval vessels carrying nuclear payloads from entering Lithuanian airspace, territorial waters, or port facilities.[1][4]

"By addressing the legal exceptions that Lithuania had compared with other EU and NATO countries, they will be gone and we will be equal," Olekas told reporters ahead of the parliamentary vote.[1][4]

Defense Minister Robertas Kaunas directly tied the legislative push to the deteriorating regional security environment. He argued that the government must utilize all available legal and military options to bolster national defense against external threats.[4]

"We are responding to Russia's aggression," Kaunas said during the proceedings. "If Russia had not started the war in Ukraine, we probably would not be having the discussions we are having today."[4]

The constitutional revision coincides with shifting nuclear deterrence strategies across Europe. French President Emmanuel Macron recently proposed a framework that would allow partner nations to temporarily host French strategic air forces during periods of heightened tension.[4]

Under NATO's existing nuclear sharing arrangements, United States nuclear weapons are stationed in five European countries: Belgium, Germany, Italy, the Netherlands, and Turkey. The Lithuanian amendment would legally permit Vilnius to join this framework or host temporary deployments during crises.[1][4]

Opposition and domestic debate

Resistance within the Seimas came primarily from the opposition Dawn of Nemunas party. Fourteen of its representatives voted against the amendment during the October 6 session, while two others formally abstained from the ballot.[4]

Party representative Aidas Gedvilas argued that altering the state's foundational security posture requires direct voter approval. The faction proposed submitting the nuclear weapons question to a national referendum rather than deciding it through standard parliamentary procedure.[4]

Conversely, conservative lawmakers supported the measure, arguing that the existing ban actively degrades military readiness. They noted that the restriction prevents Lithuania from fully participating in NATO's integrated nuclear deterrence planning and joint exercises.[1][4]

Lithuania's geographic position drives much of the urgency behind the legislative effort. The Baltic state shares a 679-kilometer border with Belarus to the east and borders the heavily militarized Russian exclave of Kaliningrad to the west.[1][4]

Kaliningrad already hosts Russian Iskander short-range ballistic missile systems, which are capable of delivering either conventional or nuclear payloads. Lithuanian military planners view the constitutional amendment as a necessary legal counterweight to this existing regional strike capability.[1][4]

Russian diplomatic response

The Kremlin immediately condemned the parliamentary vote, characterizing the potential deployment of allied nuclear weapons as a direct threat to Russian national security. Russian officials warned that the legislative move would fundamentally destabilize the Baltic region.[3][7]

Kremlin spokesman Dmitry Peskov warned that moving NATO military infrastructure closer to the border would inevitably escalate regional tensions. He stated that Moscow would monitor the January parliamentary vote and any subsequent NATO deployments closely.[4][7]

"Neither of these developments will contribute to stability and predictability on the European continent; on the contrary, they will, much to our regret, mark yet another significant escalation of tensions," Peskov told reporters on October 6.[4][7]

Peskov stated that Russia would be forced to implement necessary measures to ensure its security if the amendment passes. The Russian government previously indicated that Lithuania would become a primary target if it hosted allied nuclear systems.[3][7]

Despite the legislative momentum, NATO has not announced any plans to station nuclear warheads in Lithuania. The amendment functions as a legal enabling mechanism to clear airspace and ports, rather than an authorization for a specific, imminent weapons deployment.[1][4]

Regional military buildup

The nuclear debate parallels a broader expansion of conventional military forces in the region. Lithuania currently hosts a multinational NATO forward presence battalion and is preparing infrastructure for the permanent stationing of a German military brigade.[1]

The German deployment, scheduled to reach full operational capacity by 2027, represents Berlin's first permanent foreign military basing since the Second World War. It includes approximately 4,800 soldiers and civilian personnel stationed near the Suwalki Gap.[1]

Discussions regarding a permanent United States military base in Lithuania have also surfaced in recent weeks. The proposed constitutional changes would facilitate such an installation by removing the parallel prohibition on foreign military bases from Article 137.[4]

The trajectory of Lithuania's security architecture now depends entirely on the January 2027 parliamentary session. If the Seimas secures the 94-vote supermajority, the legal barrier to nuclear deployments will fall, shifting the next decision directly to NATO military planners.[1][4]