The Arctic is changing quickly: environmentally, economically, and politically, without sustainable political and military cooperation because of the conflicts of interest among the stakeholders. Russia, Canada, the United States, the Nordic states, and non-Arctic states such as China, Japan, and others see the economic benefits from the region but struggle with addressing the security challenges and the potential environmental impact of activities conducted there. This book provides a snapshot of the areas connecting transport, environmental security, resource development, and military security with contributions written in 2021 and others written after Russia’s second invasion of Ukraine.