Showing how the development of space technology could affect the present system of deterrence, the authors consider the consequences for U.S. foreign policy, alliance relations, and strategic stability. In the first essay, Dr. Tucker argues that a greater commitment to defensive systems would not substantially affect deterrence or extended deterrenTable of Contents: Preface -- Introduction -- General Considerations on SDI and U.S. Foreign Policy -- The Challenge of SDI: Preemptive Diplomacy or Preventive War? -- The Implications of SDI for U.S.-European Relations -- SDI, Europe, and the American Strategic Dilemma -- Westview Press/Foreign Policy Institute