151Furthermore, in conformity with the customary rule codified in Article 29 of the Vienna Convention, an international agreement may, by way of derogation from the general rule that such an act binds each party in respect of its entire territory, bind a State in respect of another territory if such an intention is apparent from that agreement or is otherwise established. In that context, such an agreement is liable to affect a third party within the meaning of the general international legal principle of the relative effect of treaties, and the third party must consent to the agreement (see, to that effect, Council v Front Polisario, paragraphs 94, 98, 103 and 106).