It is always appropriate to ask whether an expedient foreign policy is morally justifiable, just as it is always appropriate to ask whether a morally defensible policy is consistent with the national interest. The ongoing dialogue between morality and realpolitik gives much of foreign policy debate its characteristic bite. In this collection of essays, a distinguished group of philosophers, political theorists, and lawyers? including Russell Hardin and Marshall Cohen?explore these contrasting themes. In essays that are at once insightful and accessible, noted political thinkers examine the tension of the conflicting demands of morality and national self-interest in the context of the foundations of international order, the possession and use of nuclear weapons, recourse to war, and the prospects for peace. A final postscript addresses the question of the responsibility of intellectuals in the national foreign policy debate. This book will appeal to scholars and students in any discipline dealing with international affairs as well as to lay readers who wish to explore the implications of taking morality and reason seriously in foreign policy.