This book addresses four key questions about contemporary Arctic geopolitics: How do Arctic states view security from a geopolitical perspective? What conditions could re-stabilize Arctic cooperation? What forces have shaped current Arctic dynamics? And what choices could foster future collaboration, innovation, and sustainability in the region? Geopolitical contestation resulting from Russia's invasion of Ukraine has significantly impacted cooperation between Arctic states. The suspension of the Arctic Council under Russia's chairmanship, Finland and Sweden's NATO accession, limited progress under Norway's chairship, increasing militarization in Russian and Nordic Arctic territories, expanding military exercises, and governance challenges under Denmark's new chairship represent the new realities of Arctic geopolitics. Environmental and climate threats emanating from the Arctic, once the primary concern for regional and global states, have been overshadowed by traditional hard security considerations. Consequently, the Arctic's strategic importance has grown exponentially while trust between East and West has deteriorated. Military threat perceptions between the Arctic Seven NATO members and Russia now stand at unprecedented levels. This edited volume presents diverse perspectives on how Arctic states are reassessing existing and future governance and security mechanisms in the region. This book will appeal to scholars and students of international relations, security studies, Arctic studies, and geopolitics, as well as policymakers, diplomats, and anyone interested in contemporary Arctic governance, climate security, and great power competition in polar regions. The chapters in this book were originally published as a special issue of Strategic Analysis.