Arctic experts talk about the circumpolar region as three Arctics—North American, European, and Russian (sometimes called Asian)—each with unique physical characteristics that heavily influence their defense and security considerations. The differences between the regions are usually expressed in terms of climate, topography, geography, populations, resources, and infrastructure. Because the Arctic is intended to be a zone of peace and cooperation, nations with Arctic interests normally focus on nonmilitary security topics such as food security, economic security, energy security, and environmental security. Less addressed are the military threats to peace and stability in the Arctic. This article will examine those emerging military threats in the European Arctic and High North that are challenging the United States, its allies, and its partners.