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Why the US's top military commander in Europe goes to sleep thinking about how to get around the continent

Since Russia's 2014 incursion in Ukraine, NATO leaders have been focused on securing the alliance's eastern flank. But defending that boundary and deterring threats to member countries there takes more than just deploying troops. It means moving them in and out, and, if necessary, reinforcing them, and that's something that's always on U.S. and European military commanders' minds