324. International responsibility and international liability for lawful acts.

International responsibility arises upon the commission of an internationally wrongful act; responsibility is thus the corollary of the breach of an international obligation1. As such international responsibility is to be distinguished from what has come to be referred to as liability for acts not prohibited by international law2. The precise scope of the latter category is not entirely clear; a number of the leading cases often relied upon to justify the existence of liability as a separate category may be analysed as in fact concerning breach of an international obligation (and thus concerning questions of international responsibility properly so-called),