-8of Treaties of 1969, States cannot invoke their municipal laws to escape their preestablished international responsibility. 2 The treaty obligations of States Parties are binding on all State powers and organs. 6. That the States Parties to the Convention are required to guarantee compliance with the provisions thereof and their effects (effet utile) at the domestic law level. This principle applies not only in connection with the substantive provisions of human rights treaties (i.e. those dealing with the protected rights) but also in connection with procedural rules, such as the ones concerning compliance with the decisions of the Court. Such obligations are to be interpreted and enforced in a manner such that the protected guarantee is truly practical and effective, bearing in mind the special nature of human rights treaties. 3 7. That those States Parties to the Convention that have accepted the binding jurisdiction of the Court are under a duty to fulfill the obligations set by the Court. In this regard, Costa Rica is required to take such measures as may be required in order to effectively comply with the Judgment of the Court on preliminary objections, merits, reparations and costs of July 2, 2004 (supra Having Seen clause No. 1) and its Orders on the status of compliance with said Judgment. This obligation includes the State’s duty to report on the measures adopted to comply with such decisions of the Court. Timely fulfillment of the State’s obligation to report to the Court on the exact manner in which it is complying with each of the aspects ordered by the latter is essential to evaluate the status of compliance in this case. * * * 8. That, in monitoring comprehensive compliance with the Judgment on preliminary objections, merits, reparations and costs delivered in the instant case, and after having analyzed the information supplied by the State, the Inter-American Commission and the victim’s representatives in their briefs on compliance with the judgment (supra Having Seen clauses No. 4, 5, 7, 8 and 9), the Court has verified which aspects of such Judgment are still pending compliance and which ones have been partially complied with. 9. That, in its Order of September 12, 2005 (supra Having Seen clause No. 2) the Court verified that Costa Rica has partially complied with its obligations to pay non-pecuniary damages and reimburse expenses, and that only payment of arrearage interest is still pending. Pursuant to the ninth operative paragraph of the Judgment of the Court, the State is required to pay arrearage interest accrued from February 6, 2005 to the date of actual payment. As per the information provided to the Court, payment of said interest is still pending. Through its Brief of January 30, 2006 (supra Having Seen clause No. 7), the State reported that, on October 20, 2005, it requested that the Minister of the Treasury “take all appropriate measures Cf. Case of Five Pensioners. Compliance with Judgment, supra note 1, Considering clause No. 7; Case of the Constitutional Court. Compliance with Judgment, supra note 1, Considering clause No. 5; and Case of 19 Tradesmen. Compliance with Judgment, supra note 1, Considering clause No. 5. 2 3 Cf. Case of Five Pensioners. Compliance with Judgment, supra note 1, Considering clause No. 8; Case of the Constitutional Court. Compliance with Judgment, supra note 1, Considering clause No. 6; and Case of 19 Tradesmen. Compliance with Judgment, supra note 1, Considering clause No. 6.