In May 2022, Sweden and Finland applied for NATO membership. The decision arrived at a time of the outbreak of the war in Ukraine, which sparked, and is continuing to elicit, growing security concerns among its European neighbors. Both Sweden and Finland have engaged in regular military cooperation with NATO allies, especially with respect to the sale and purchase of military equipment. Finland’s decision to purchase 64 F-35 aircraft from the US aerospace corporation Lockheed Martin in early 2022 was viewed as a move that, although not entirely indicative of a NATO future, provided a parallel with the neighboring, fellow Arctic country Norway, which also operates the F-35 aircraft. Indeed, the sense of shared military prowess and interoperability between Arctic countries and the wider NATO intergovernmental organization as a whole is a fundamental component of both the feasibility and practicality of Sweden and Finland’s decision to join NATO.