The traditional international law of self-defense provides little indication about how far states should be willing to defend. That choice is better understood as constrained, beyond the jus in bello and the jus ad bellum, by human rights norms that implicate responsibilities of the sovereign vis-à-vis its own population. Different conceptions of human rights, however, underscore different possible theories of the extent of self-defense. The main polarity is between a conception of self-defense as protecting bare life and a conception of (...) self-defense as protecting collective self-determination. In the practice of justifying particular uses of self-defense, these foundations are constantly and dynamically rearticulated to justify fighting on, surrendering, or negotiating. This raises questions about the impact of conditions of uncertainty, different conceptions of agency, and the role of the international community. Ultimately, the article suggests that self-defense radicalizes anxieties about the foundation and finality of rights. (shrink)