Changing Arctic security and NATO's approaches after the Cold War: Risks and challenges

This dissertation examines the transformation of the Arctic region in the post–Cold War era and analyzes how this transformation reshapes NATO's security architecture. Accelerating climate change, the growing economic and technological accessibility brought about by globalization, and the increasingly visible dynamics of great-power transition have elevated the Arctic's geopolitical significance. The rapid retreat of sea ice, the opening of new maritime routes, and easier access to energy and mineral resources have turned the region into a space of intensified competition among both Arctic littoral states and non-Arctic actors. These developments have compelled NATO to reassess its strategic posture toward the High North. The primary aim of this study is to identify the risks, opportunities, and strategic imperatives emerging from the environmental, economic, and geopolitical transformation of the Arctic and to evaluate their implications for NATO. The dissertation is grounded in two main hypotheses: (1) As a result of climate change, globalization, and shifting power balances, the strategic distinction between the Arctic and the Atlantic is diminishing, thereby confronting NATO with a new domain of threats and responsibilities. (2) By the mid-twenty-first century, the Arctic will likely become one of the principal arenas of great-power competition among the United States, Russia, and China. Methodologically, the study employs a qualitative research design. NATO's strategic concept documents, national Arctic policy papers, academic literature, reports by international organizations, and statistical data are systematically analyzed. Through this multi-layered examination, the dissertation traces the historical evolution of Arctic security, identifies the structural dynamics shaping the region, and evaluates NATO's evolving security approach in light of recent geopolitical developments. The findings demonstrate that the Arctic is no longer merely a region defined by environmental vulnerabilities; rather, it has become a critical security arena characterized by military build-up, expanding great-power rivalry, emerging energy-geopolitics linkages, and strategic opportunities associated with new maritime corridors. Russia's military modernization in the region, China's expanding polar activities, and the accession of Finland and Sweden to NATO collectively underline the Arctic's growing centrality in the Alliance's deterrence and defense planning. In conclusion, the study argues that the Arctic's rising geopolitical relevance necessitates a more comprehensive, adaptive, and multidimensional regional strategy for NATO. Managing the region's evolving security landscape will require sustained engagement, enhanced situational awareness, and the development of coherent policies that balance deterrence, diplomacy, and cooperative security mechanisms. Keywords: Arctic, NATO, Military Security, Hihg North, Climate Change.