The case law and Statute of the International Court of Justice have filled important gaps in the Court's case law. They have also constituted important milestones in the Court's interpretation and development of ECHR. Overall, the ECtHR has treated them as authoritative sources of inspiration and it has rarely disagreed with the ICJ's findings. A survey of the case law reveals that there is no general and coherent approach underpinning the Court's references. Being rather irregular, these references have acquired great importance as a result of the individual developments that they introduced. This chapter discusses a number of these important adaptations introduced in number of areas, including interim measures, the opposability of reservations, and the primacy of the UN Charter.