HOW THE RUSSIAN-UKRAINIAN WAR IS CHANGING NATO: FROM THE ANNEXATION OF CRIMEA TO FULL-SCALE INVASION

This article examines NATO’s transformation under the influence of the Russo-Ukrainian war, tracing developments from the annexation of Crimea in 2014 to Russia’s full-scale invasion of Ukraine in 2022. The study aims to identify key changes in the Alliance’s strategy, military capabilities, and identity in response to the new phase of Russian aggression. A systematic approach is applied to the analysis of NATO documents, academic literature, and political initiatives, allowing the author to track the Alliance’s adaptation to the evolving European security environment. The relevance of the topic stems from the need to assess NATO’s ability to respond promptly to existential threats and maintain political cohesion in times of crisis. The novelty of the research lies in its comprehensive examination of the evolution of NATO’s three core dimensions–strategy, capabilities, and identity–across two critical junctures in contemporary history.The article demonstrates that the annexation of Crimea triggered NATO’s return to the paradigm of collective defense. The Alliance implemented the Readiness Action Plan (RAP), established the Very High Readiness Joint Task Force (VJTF) and a network of NATO Force Integration Units (NFIUs), and deployed multinational battlegroups in the Baltic States and Poland under the Enhanced Forward Presence (eFP) framework. In response to the 2022 invasion, NATO adopted a new Strategic Concept, designated Russia as its primary security threat, increased troop numbers, introduced the NATO Force Model, established the Allied Reaction Forces (ARF), and reinforced the eastern flank by transitioning from battalion- to brigade-level deployments. The accession of Finland and Sweden to NATO profoundly altered the strategic configuration of Northern Europe, significantly enhancing the Alliance’s defensive posture.The study concludes that the Russo-Ukrainian war has acted as a powerful catalyst for structural and conceptual change within NATO. The Alliance has demonstrated strategic flexibility, political unity, and an ability to respond rapidly to large-scale aggression. Nevertheless, several challenges remain, including the need to secure long-term defence funding, counter asymmetric threats, and define NATO’s role beyond the Euro-Atlantic area.