This study aims to analyze the supervisory function of the House of Representatives (DPR) in international treaties and to examine the legal validity of Indonesia’s participation in the Board of Peace (BOP) within the framework of constitutional law. The research addresses two main issues: the form of DPR supervision in international agreements and the validity of the BOP agreement in relation to such supervision. This study employs a normative juridical method with statutory and conceptual approaches, based on the 1945 Constitution, Law Number 24 of 2000, and relevant legal literature. The results show that DPR supervision is theoretically exercised in two stages, namely before and after the agreement is concluded. However, in practice, such supervision tends to be ineffective. In the BOP case, the absence of DPR approval at both stages results in procedural defects. Based on the theory of legal validity, this condition leads to the invalidity of the agreement and implies nullity, rendering it legally non-binding within the national legal system.
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