“…However, the presence of Serikin market is not through bilateral agreements, nor is it a region with servitude for Indonesia, but the area is deemed to be like the servitude intended for Indonesia. In relation to its strategic location, cross-border trade in Serikin, and its implications for bilateral relations, security and border politics, has become a special study in Southeast Asian studies (Awang et al, 2013;Djafar et al, 2016;Hutasuhut et al, 2018;Abao, 2020;Awang et al, 2017;Sulehan et al, 2013;Hsia, 2019;Azmi et al, 2017). However, much of the focus of previous studies has only been on relations between border populations and informal trade relations, and does not specifically address the existence of such regions in terms of international law and regional economics at large.…”