This paper discusses Indonesia’s cyber diplomacy strategy as a deterrence means to deal with the threat of cyberspace security in the Indo-Pacific region. Advances in information and communication technology in each country have driven new threats in cyberspace. Indonesia as one of the highest internet user countries in the world is inseparable from the threat of attacks in the cyberspace. The literature method is used to interpret the problem and to present more details in the cyber diplomacy efforts. This literature method approach is used to find perceptions and definitions from various references in relevant contexts and to carry out a process of identifying the defense forces possessed by cyber institutions in Indonesia and the challenges faced in the Indo-Pacific region. Following the circumstances, risk mitigation can be carried out as the basis for developing cyber diplomacy strategies and policies in Indonesia. However, this defense diplomacy strategy may not be effective if it is only carried out in dichotomic by one or two agencies only.

Over the last few decades, ASEAN is considered as a copycat of the system of the European Union (EU). ASEAN is considered weaker, lacks strong support from its members, has less substantive achievements, and is nothing more than competition between ASEAN member countries, where the EU has gone further in its implementation. This assessment has recently been canceled. The EU is currently faced with a list of daunting challenges - the ongoing debt crisis in Greece, increasing criticism by right-wing political groups over the European Union's fundamental agreement on freedom of movement within the EU. The refugee crisis and the growing movement of secession from member states - Britain and Spain are the most prominent examples. Of course, the EU now faces its most significant and most existent challenge, political vortex and divisions with the launch of a referendum in Britain, which resulted in 'Brexit.' This paper tries to analyze how Brexit phenomenon is suspected to occur in ASEAN due to the principle of regionalism, clashes with the sovereignty of each member country. The method used is descriptive analysis with a literature review. Based on research, Brexit in the EU has a context and substance of regionalism that is different from the conditions that exist in ASEAN. Nevertheless, Brexit is an early warning for ASEAN, which has heterogeneous regionalism. Furthermore, ASEAN is pushing for centrality and strengthening ASEAN integration in responding to the turmoil and political change taking place in the Southeast Asian region.