Sweden warns Russia may test NATO's Article 5 'relatively soon' as military buildup near borders intensifies

Swedish commission issues stark warning

On 12 June 2026, the Swedish Parliamentary Defence Commission released its long-term defence planning report, stating that "an armed attack against Sweden or its allies cannot be excluded." The report warns that Russian military offensives designed to test the cohesion and credibility of NATO's Article 5 mutual defence clause could materialise in the "relatively near future" if the Kremlin judges political conditions to be favourable. The commission, composed of MPs from all parties in the Swedish parliament, noted that Moscow might act even without conventional military superiority.

“We can note that the security situation remains serious and characterised by a considerable degree of unpredictability. There is a risk of rapid deterioration with serious consequences for the security of Sweden and Europe.”

Russia's expanding military footprint

The Swedish report coincides with a Danish radio DR investigation, published on 10 June, which used confidential intelligence from Nordic sources to detail an accelerated Russian military buildup along the alliance's northern and eastern flanks. Nordic intelligence chiefs and senior officers, speaking anonymously, confirmed that Russia has significantly increased its military presence near Finland, Norway, and the Baltic states. On 11 June, The Telegraph published geolocated satellite images that corroborated the intelligence: new barracks, canteens, and logistics depots have sprung up along the Russia–Finland border, a new military base is under construction near Novaya Vilga in Karelia, and a greater concentration of military vehicles has been observed near Estonia's border. The Kaliningrad exclave is also expanding its troop infrastructure.

“We don't believe they are stationed there just for show. It's about the ability to face NATO in a larger conflict later on. They are preparing for a major conflict.”

The window of vulnerability

Sources from Nordic intelligence services rated the threat of a Russian attack as the highest in the next one to three years, a period during which European nations are still strengthening their own defence capabilities. The Swedish commission's report stressed that Russia's key military elements — air and naval forces, long-range strike capabilities, and hybrid warfare assets — have been relatively unaffected by the war in Ukraine. The document also flagged Moscow's formation of new units in the Leningrad district and its continuing military consolidation in the Kola Peninsula and the Arctic.

“They know that the entire Western world is about to rearm. So I wonder: why would they wait to exploit what they consider to be our weaknesses?”

A broader geopolitical shift

The commission noted a marked change in the transatlantic security environment since its previous report in 2024. It described current US foreign and security policy under the present administration as increasingly characterised by "unpredictability, rapid changes, transactional, tougher rhetoric and a greater willingness to use military force unilaterally." Sweden, which abandoned two centuries of military non-alignment to join NATO in 2024 after Russia's full-scale invasion of Ukraine, plans to raise its defence spending from 2.8% of GDP this year to 3.5% by 2030. The report's warnings underscore the precarious state of European security as the alliance braces for a potential test of its founding principle.