  It is utopian to ignore the reality of power in international relations, but it is equally blind to rely on power alone. Thucydides appears to support neither the naive idealism of the Melians nor the cynicism of their Athenian opponents. He teaches us to be on guard “against naïve-dreaming on international politics,” on the one hand, and “against the other pernicious extreme: unrestrained cynicism,” on the other (Donnelly 2000, 193). If he can be regarded as a political realist, his realism nonetheless prefigures neither realpolitik, in which traditional ethics is denied, nor today’s scientific neorealism, in which moral questions are largely ignored. Thucydides’ realism, neither immoral nor amoral, can rather be compared to that of Hans Morgenthau, Raymond Aron, and other twentieth-century classical realists, who, although sensible to the demands of national interest, would not deny that political actors on the international scene are subject to moral judgment.  