Artikel 35

When, after separation of any part of the territory of a State, the predecessor State continues to exist, any treaty which at the date of the succession of States was in force in respect of the predecessor State continues in force in respect of its remaining territory unless:
(a) the States concerned otherwise agree;
(b) it is established that the treaty related only to the territory which has separated from the predecessor State; or
(c) it appears from the treaty or is otherwise established that the application of the treaty in respect of the predecessor State would be incompatible with the object and purpose of the treaty or would radically change the conditions for its operation.