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ARTICLE-21: Legal effects of reservations and of objections to reservations     [go to this ARTICLE]
... (a) modifies for the reserving State in its relations with that other party the provisions of the treaty to which the reservation relates to the extent of the reservation; and ...
... (b) modifies those provisions to the same extent for that other party in its relations with the reserving State. ...
... 3. When a State objecting to a reservation has not opposed the entry into force of the treaty between itself and the reserving State, the provisions to which the reservation relates do not apply as between the two States to the extent of the reservation. ...


ARTICLE-30: Application of successive treaties relating to the same subject-matter     [go to this ARTICLE]
... 3. When all the parties to the earlier treaty are parties also to the later treaty but the earlier treaty is not terminated or suspended in operation under article 59, the earlier treaty applies only to the extent that its provisions are compatible with those of the latter treaty. ...


ARTICLE-62: Fundamental change of circumstances     [go to this ARTICLE]
... (b) the effect of the change is radically to transform the extent of obligations still to be performed under the treaty. ...


ARTICLE-71: Consequences of the invalidity of a treaty which conflict with a peremptory norm of general international law     [go to this ARTICLE]
... (b) does not affect any right, obligation or legal situation of the parties created through the execution of the treaty prior to its termination; provided that those rights, obligations or situations may thereafter be maintained only to the extent that their maintenance is not in itself in conflict with the new peremptory norm of general international law. ...