Lt. Col. Darren Turner briefs soldiers from the 5th Canadian Division during Operation Nanook, Canada's annual Arctic training and sovereignty operation, in Inuvik, Northwest Territories, in March. (Cole Burston/AFP/Getty Images) By Greg Pollock and Imran Bayoumi

Greg Pollock, an adjunct professor in the School of Foreign Service at Georgetown University, is former principal director and acting deputy assistant secretary of defense for Arctic and global resilience policy. Imran Bayoumi is an associate director with the GeoStrategy Initiative in the Atlantic Council’s Scowcroft Center for Strategy and Security.

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