A comprehensive ideal of global justice is not yet theoretically justifiable: nonetheless, it does not deserve the scepticism :(commonly expressed by) many statists express towards it. To create a kind of continuity between global justice –‘Cosmopolis’– and interstate justice –‘Leviathan’– a third, ‘Liberal’ option is proposed. The statist argument is presented through a discussion of Thomas Nagel’s position on global justice. The cosmopolitan argument is presented through a discussion of Amartya Sen’s overall vision of justice. The liberal view, modeled on Rawls’ political philosophy, “proposes” that the right cannot consist in a mere realization of the good. Liberals that respect the ‘priority of right’ believe that morality has to be different from politics. By bypassing institutionalism through moralism, cosmopolitans contradict the priority of the right. Contrary to cosmopolitans, the author maintains that the only moral source of global justice compatible with the priority of the right consists in a duty to protect life in case of ‘urgency’. This duty is not purely humanitarian – as statists would have it – and captures the ethical appeal of cosmopolitanism.