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such a conflict arises.201 Whether or not a treaty conflicts with a
peremptory norm “can only be determined after [establishing]
the meaning of the treaty,” which, in turn, can only be
established through the application of Articles 31 and 32 of
VCLT.202 The Commission envisages that jus cogens norms are
treated as “strong interpretative principles” 203 to be invoked
during the process of interpretation.
As well as calling attention to the requirement that
treaties or treaty provisions “be interpreted in good faith,” in
keeping with the ordinary meaning of the text, and “in their
context and in light of the object and purpose of the treaty,” a
2006 report by the Commission’s Study Group on fragmentation
emphasizes Article 31(3)(c)—which is often “taken to express . . .
the principle of systemic integration.”204 Article 31(3)(c) provides
that the interpreter “shall take into account [a]ny relevant rules
of international law applicable in the relations between the
parties.”205 According to the Commission’s Study Group, treaties
must be interpreted against the background of their normative
environment and in keeping with these norms. 206 As the
Commission’s Study Group explained, “[t]his points to the need
to carry out interpretation so as to see the rules in view of some
comprehensible and coherent objective,” and, crucially, to do so
in such a way so as to give priority to “concerns that are more
important at the cost of less important objectives.” 207 These
background rules, according to the 2017 report by the
Commission’s Special Rapporteur Tladi, include jus cogens
norms.208 As Cezary Mik explains, “[t]his means that in cases of
normative conflicts with peremptory norms that can be resolved
through interpretation, one has to rely on such interpretative
rules that will support a jus cogens-friendly interpretation of
55–59.
201 Special Rapporteur, Third Report on Jus Cogens, supra note 196, ¶¶
202 Id. ¶ 56.
203 Int’l L. Comm’n, Rep. on the Work of Its Fifty-Third Session,
Supplement No. 10, U.N. Doc. A/56/10, at 85 (2001) [hereinafter Int’l L. Comm’n,
Fifty-Third Session].
204 Int’l L. Comm’n, Fragmentation of International Law, supra note
193, ¶¶ 412–424 (internal quotations omitted) (internal citations omitted).
205 Special Rapporteur, Third Report on Jus Cogens, supra note 196, ¶¶
55–59 (internal quotations omitted).
206 Int’l L. Comm’n, Fragmentation of International Law, supra note
193, ¶ 419.
207 Id.
208 Special Rapporteur, Third Report on Jus Cogens, supra note 196, ¶¶
55–59.