Evolution of NATO's strategic concepts in response to threat perception: The case of the Russian federation Ukraine war

This master's thesis examines the impact of the Russia-Ukraine War on NATO's security strategies within the framework of the concept of threat. NATO is a political-military organization committed to safeguarding the freedom and security of its Allies by responding swiftly to threats. The purpose, mission, and responsibilities of NATO have always been shaped by the international security environment. Its most crucial aim and responsibility have been to provide collective defense against all forms of threats. NATO has responded to developments in international relations and perceived threats through its Strategic Concepts. The changes in NATO's security policies are primarily evaluated within the framework of the NATO 2030 Report and the NATO 2022 Strategic Concept. The threat posed by the Russian Federation- Ukraine War has led to significant changes in NATO's security strategies. As a result, it is concluded that the Russia-Ukraine War has led the Alliance to adopt a more effective defense strategy in response to increasing security threats in Eastern Europe with a new Strategic Concept.