Following Russia’s invasion of Ukraine in 2022, Finland and Sweden made the historic decision to seek membership in the North Atlantic Treaty Organization (NATO). While Washington greeted this decision as an opportunity to strengthen the alliance and reinforce Russia’s strategic miscalculation in starting the war, Turkish President Recep Tayyip Erdoğan saw Finland’s and Sweden’s membership aspirations as an opportunity to seek concessions over arms sales, Turkey’s pursuit of membership in the European Union, and Stockholm’s perceived sympathy for Kurdish militants. After signing off on Finland’s membership in March 2023, Turkey only approved Swedish membership in January 2024 after Sweden approved new counterterrorism legislation—and after the administration of U.S. President Joe Biden agreed to sell Turkey modernized F-16 fighter jets.

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Jeffrey Mankoff is a Distinguished Research Fellow in the Center for Strategy and Military Power, Institute for National Strategic Studies, at the National Defense University.