What do we owe others as a matter of global justice and does national membership matter?

David Miller offers us a sophisticated account of how we can reconcile global obligations and duties to co-nationals. In this article I focus on four weaknesses with his account such as the following two. First, there remains considerable unclarity about the strength of the positive duties we have to non-nationals and how these measure up relative to other positive duties, such as the ones Miller believes we have to co-nationals to implement civil, political, or social rights. Second, just how responsibilities for enacting our global commitments will be assigned still needs further development. A unifying theme of my criticisms concerns Miller's account of how we are to mediate responsibilities to fellow-nationals and the partiality we may defensibly show co-nationals. In the final section I sketch an alternative way of conceptualizing our duties to fellow-nationals and duties to non-nationals, which can give more systematic advice about the partiality we may defensibly show co-nationals.