Th. Eustathiades, Constantin Keywords: Subjects of international law | Accountability | State responsibility | Mots clefs: Sujets du droit international | Responsabilité | Responsabilité des Etats | ABSTRACT Constantin Th. Eustathiades begins his course on the new trends affecting the concept of the subject of international law and the international responsibility with a study of the subjects of international law, within the framework of which, in particular, the problem of the individual subject of international law is ad…