The resurgence of Russian power in the Arctic and High North will be a key consideration for NATO planners. The Alliance's northern flank represents both a potential vulnerability due to its relative isolation and an area in which NATO enjoys options for horizontal escalation in a conflict. Moreover, as the effects of climate change create opportunities for both navigation and resource extraction, peacetime control over the Northern Sea Route (NSR) and a contest to establish effective administrative control in this area are likely. Disagreements regarding the degree of Russia's...