46 BOSPHORUS HAVA YOLLARI TURİZM VE TİCARET ANONİM ŞİRKETİ v. IRELAND JUDGMENT considered to protect fundamental rights, as regards both the substantive guarantees offered and the mechanisms controlling their observance, in a manner which can be considered at least equivalent to that for which the Convention provides (see M. & Co., cited above, p. 145, an approach with which the parties and the European Commission agreed). By “equivalent” the Court means “comparable”; any requirement that the organisation's protection be “identical” could run counter to the interest of international cooperation pursued (see paragraph 150 above). However, any such finding of equivalence could not be final and would be susceptible to review in the light of any relevant change in fundamental rights protection. 156. If such equivalent protection is considered to be provided by the organisation, the presumption will be that a State has not departed from the requirements of the Convention when it does no more than implement legal obligations flowing from its membership of the organisation. However, any such presumption can be rebutted if, in the circumstances of a particular case, it is considered that the protection of Convention rights was manifestly deficient. In such cases, the interest of international cooperation would be outweighed by the Convention's role as a “constitutional instrument of European public order” in the field of human rights (see Loizidou v. Turkey (preliminary objections), judgment of 23 March 1995, Series A no. 310, pp. 27-28, § 75). 157. It remains the case that a State would be fully responsible under the Convention for all acts falling outside its strict international legal obligations. The numerous Convention cases cited by the applicant company in paragraph 117 above confirm this. Each case (in particular, Cantoni, p. 1626, § 26) concerned a review by this Court of the exercise of State discretion for which Community law provided. Pellegrini is distinguishable: the State responsibility issue raised by the enforcement of a judgment not of a Contracting Party to the Convention (see Drozd and Janousek v. France and Spain, judgment of 26 June 1992, Series A no. 240, pp. 34-35, § 110) is not comparable to compliance with a legal obligation emanating from an international organisation to which Contracting Parties have transferred part of their sovereignty. Matthews can also be distinguished: the acts for which the United Kingdom was found responsible were “international instruments which were freely entered into” by it (see paragraph 33 of that judgment). Kondova (see paragraph 76 above), also relied on by the applicant company, is consistent with a State's Convention responsibility for acts not required by international legal obligations. 158. Since the impugned measure constituted solely compliance by Ireland with its legal obligations flowing from membership of the European Community (see paragraph 148 above), the Court will now examine whether a presumption arises that Ireland complied with the requirements of