Northern Approaches: Finland, Sweden, and the Growing Opportunities for Allied Irregular Warfare

Finland and Sweden's accession to NATO, prompted by Russia's invasion of Ukraine, has significantly bolstered the Alliance's capabilities, adding 15 million people and doubling the NATO-Russia land border to 1,584 miles. This development enhances irregular warfare (IW) opportunities, both defensively and offensively, by leveraging the Nordics' strong militaries, societal resilience, and geographic proximity to Russia. Defensively, Finland contributes a massive reservist force of up to 870,000 trained citizens, the Hybrid Center of Excellence for countering hybrid threats, and winter warfare expertise from its special operations forces. Sweden adds its Total Defence model, which prepares civilians through informational brochures, a specialized submarine fleet for Baltic Sea operations, and a robust defense industrial base producing advanced systems like the Gripen fighter jet. Offensively, the Nordics' location creates dilemmas for Moscow, enabling NATO to threaten key Russian assets in areas like the Kola Peninsula and St. Petersburg while facilitating reinforcements and deterrence through flexible options involving special operations. This shift forces Russia to reallocate resources, stretching its military posture across a longer border and reducing focus on other fronts like Ukraine. While risking security dilemmas, these IW enhancements strengthen NATO's northern flank without necessitating large-scale escalations, turning what was once neutral territory into a strategic advantage for the Alliance.