The Lowy Institute have put up a post asking whether there is a libertarian view on foreign policy.
what do libertarians believe to be the proper role of government when it comes to international affairs? Libertarians like their government small and out of the way, but they presumably agree that there are some things government ought to be good at, like defending the country and protecting its interests.
So to get the discussion going, I thought some quotes from Ludwig von Mises would be in order. From Liberalism
For the liberal, there is no opposition between domestic policy and foreign policy, and the question so often raised and exhaustively discussed, whether considerations of foreign policy take precedence over those of domestic policy or vice versa, is, in his eyes, an idle one. For liberalism is, from the very outset, a world-embracing political concept, and the same ideas that it seeks to realize within a limited area it holds to be valid also for the larger sphere of world politics. If the liberal makes a distinction between domestic and foreign policy, he does so solely for purposes of convenience and classification, to subdivide the vast domain of political problems into major types, and not because he is of the opinion that different principles are valid for each.
The goal of the domestic policy of liberalism is the same as that of its foreign policy: peace. It aims at peaceful cooperation just as much between nations as within each nation. The starting point of liberal thought is the recognition of the value and importance of human cooperation, and the whole policy and program of liberalism is designed to serve the purpose of maintaining the existing state of mutual cooperation among the members of the human race and of extending it still further. The ultimate ideal envisioned by liberalism is the perfect cooperation of all mankind, taking place peacefully and without friction. Liberal thinking always has the whole of humanity in view and not just parts. It does not stop at limited groups; it does not end at the border of the village, of the province, of the nation, or of the continent. Its thinking is cosmopolitan and ecumenical: it takes in all men and the whole world. Liberalism is, in this sense, humanism; and the liberal, a citizen of the world, a cosmopolite.
On this point Andrew Norton has a discussion going on whether Australia is an arbitrary nation-state.
Mises on war from Human Action.
What distinguishes man from animals is the insight into the advantages that can be derived from cooperation under the division of labor. Man curbs his innate instinct of aggression in order to cooperate with other human beings. The more he wants to improve his material well-being, the more he must expand the system of the division of labor. Concomitantly he must more and more restrict the sphere in which he resorts to military action. The emergence of the international division of labor requires the total abolition of war. Such is the essence of the laissez-faire philosophy of Manchester. This philosophy is, of course, incompatible with statolatry. In its context the state, the social apparatus of violent oppression, is entrusted with the protection of the smooth operation of the market economy against the onslaughts of antisocial individuals and gangs. Its function is indispensable and beneficial, but it is an ancillary function only. There is no reason to idolize the police power and ascribe to it omnipotence and omniscience. There are things which it can certainly not accomplish. It cannot conjure away the scarcity of the factors of production, it cannot make people more prosperous, it cannot raise the productivity of labor. All it can achieve is to prevent gangsters from frustrating the efforts of those people who are intent upon promoting material well-being.