This article sets out some of the key features of a realist critique of liberal moralism, identifying descriptive inadequacy and normative irrelevance as the two fundamental lines of criticism. It then sketches an outline of a political theory of modus vivendi as an alternative, realist approach to political theory. On this account a modus vivendi should be understood as any political settlement that involves the preservation of peace and security and is generally acceptable to those who are party to it. (...) In conclusion, some problems with this conception of modus vivendi and with a realist political theory more generally are discussed. In particular, the question is raised of whether a realist political theory should be understood as an alternative to liberal moralism or only a better way of doing basically the same kind of thing. (shrink)