Dupuis, Charles Keywords: Communications | International relations | Law of treaties | Intervention | State responsibility | Sanctions | Mots clefs: Communications | Relations internationales | Droit des traités | Intervention et non-intervention | Responsabilité des Etats | Sanctions | ABSTRACT The issue of the Freedom of Communication Paths, emphasizes Charles Dupuis in the introduction to his course, is one of the issues in which the opposition, not to say the antagonism, of nationalism and internationalism, the sovereignty of States and the general interest of the society of States appears in a very prominent form. The author successively focuses, in his course, on the issues of the high seas, the territorial sea, the maritime territory, the straits, maritime canals, international rivers and a navigable waterway of international concern, the railways, freedom of transit, and air communicat…