How should the countries in the Baltic Sea region and their allies meet the strategic challenges posed by an openly aggressive and expansionist Russia? NATO and the nonaligned states in the region are now more concerned about an external threat than they have been since the end of the Cold War. Russia has been probing air space, maritime boundaries, and even land borders from the Baltic republics to Sweden. Russia's undermining of Ukraine and annexation of Crimea worries former Soviet repu...