Assume, for a moment, that the necessary tools are available to induce or even force states to comply with international law. In such a state of affairs, how strongly should international law be protected? More specifically, how easy should it be to change international law? Should treaties be specifically performed or should states be given an opportunity to 'pay their way out'? In the event of states violating their commitments, what kind of back-up enforcement or sanctions should be imposed? Joost Pauwelyn uses the distinction between liability rules, property protection and inalienable...