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 republics with Russian minority populations, nonaligned Sweden and Finland are enhancing their cooperation with NATO, and the Trump presidency has created some doubt about America's willingness to follow through on NATO's collective defense commitment. Ann-Sofie Dahl brings together an international group of experts to examine Baltic security issues on a state-by-state basis and to contemplate what is needed to deter Russia in the region. The contributors analyze ways to strengthen regional cooperation, and to ensure that security in the region stays at the top of the agenda at a time of many competing strategic perspectives in the transatlantic community. This book will be of great interest to foreign policy and defense practitioners in the US and Europe as well as scholars and students of international relations.