Today, the question on the legal instruments of international organisations that impose direct sanctions on individuals and legal entities have surfaced, such as the United Nations Security Council (UNSC) Resolutions. States are obliged to implement the UNSC Resolutions but would face difficulties in this course. The UNSC’s coercive approach rubs international security against democratic legitimacy, especially when the Resolutions violate due process of law, principle of legality and human rights. To date, Indonesia’s stance on international law (including UNSC Resolutions) under its legal system remains unclear. This study analyses the implementation of the UNSC Resolutions in Indonesia, which has no uniformity without a UN Act. The case of North Korean vessel, MV Wise Honest, highlights the growing confusion in Indonesia because violation of the UNSC Resolutions has not been governed. Conclusively, Indonesia needs to enact a UN Act to provide legal certainty in the implementation of the UNSC Resolutions.