- UN Charter — Vienna Convention on the Law of Treaties
International law regime of conflicts between treaties is obtained by combining the principles of the succession of treaties over time (the later treaty abrogates the earlier one) and the principle concerning the effects of treaties on third-party States (Pacta tertiis neque nocent neque prosunt). In fact, conflicts between treaties are not frequent as states prefer to negotiate in order to avoid them. Most of the time, negotiations lead to the inclusion in a treaty of declarations of ‘compatibility’ or ‘subordination’ with another or a series of other treaties. Some of them are analysed in this chapter.