Tomuschat, Christian Keywords: Obligations of the state | Law of treaties | Public international law | Legal principles | Mots clefs: Obligations des états | Droit des traités | Droit international public | Principes généraux du droit | ABSTRACT According to Christian Tomuschat, Professor at the University of Bonn, the place to be assigned to the will of States is crucial for the understanding of the international legal order. But though the will of States plays a considerable role in the appearance of obligations that are the States…