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ARTICLE-41: Agreements to modify multilateral treaties between
certain of the parties only [go to this ARTICLE]
... (ii) does not relate to a provision, derogation from which
is incompatible with the effective execution of the
object and purpose of the treaty as a whole. ...
ARTICLE-61: Supervening impossibility of performance [go to this ARTICLE]
... 1. A party may invoke the impossibility of performing
a treaty as a ground for terminating or withdrawing from
it if the impossibility results from the permanent disappearance
or destruction of an object indispensable for the execution
of the treaty. If the impossibility is temporary, it may be invoked
only as a ground for suspending the operation of the treaty.
...
ARTICLE-70: Consequences of the termination of a treaty [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. ...
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. ...