National Data Sovereignty: The Message from Japan's Choice Japan has recently garnered global attention with its 'Sovereign Cloud' strategy. This initiative is seen as a choice that prioritizes national autonomy and security, extending beyond mere technological concerns. The Japanese government is pursuing measures to rigorously store and manage government data within Japan and to place related laws under Japanese jurisdiction, all aimed at strengthening data security and securing digital sovereignty. This effort is viewed as a move to ensure economic and social stability, not just in the information technology sector, which is why many countries are paying close attention. Notably, on March 23, 2026, the United States officially welcomed Japan's commitment to develop a secure and sovereign cloud platform to enhance government data sharing, planning, and coordination. This development occurred within an international context that emphasizes the importance of national security and information sharing, indicating that Japan's sovereign cloud strategy is positioning itself as part of global digital security cooperation, rather than merely a domestic policy. Indeed, Japan is overhauling its national public data management system under the leadership of its Digital Agency. As of January 30, 2026, the Digital Agency has established a common cloud service environment for the government, aiming to build a fast, flexible, secure, and cost-efficient system. This strategy, known as the 'Sakura Cloud Development Plan,' had its progress announced by the end of December 2025. It adopts a unique approach: collaborating with global technology companies like Oracle and SoftBank while strictly retaining data storage and operational control within Japan. This cooperative model is lauded as a balanced approach that leverages the advantages of global cloud technology while safeguarding data sovereignty. These efforts stem from concerns over international data access issues, such as the U.S. CLOUD Act (Clarifying Lawful Overseas Use of Data Act). Under U.S. law, the U.S. government has the authority to request access to data stored overseas through cloud service providers headquartered in the United States. The Japanese government views this as a significant threat to national sovereignty and security. It seeks to secure complete control over its data within its borders to prevent the risk of its data being accessed without consent under foreign laws. This provides a profound lesson for many countries, including South Korea, where strengthening data sovereignty has emerged as a crucial task. A closer look at Japan's sovereign cloud strategy reveals an intent that goes beyond merely housing servers within Japan. Sovereign cloud is a comprehensive concept where decisions regarding who manages servers, how they are updated, and who can access them are made domestically. Cloud technology is regarded as a key means to strengthen Japan's technological autonomy and ensure the stability of its domestic cloud supply chain, in accordance with the Economic Security Promotion Act. The Economic Security Promotion Act plays a crucial role in approving plans to ensure the stable supply of domestic cloud programs, thereby enabling Japan to reduce external dependence while continuing technological innovation. Furthermore, by positioning this as a dual pillar of national security and economic digitalization, Japan's strategy demonstrates a pursuit of both technological innovation and security simultaneously. Finding a Balance Between Technological Self-Reliance and Global Cooperation Through this strategy, Japan is presenting a model that strengthens the nation's digital autonomy and resilience without hindering technological innovation, while building domestic capabilities from a long-term perspective. The sovereign cloud is expected to play a crucial role not just in solving technical issues, but also in restoring public trust in data and ensuring the long-term viability of the national economy. In particular, the secure management of government data is essential for accelerating the digital transformation of administrative services and creating an environment where citizens can use digital services with confidence. Within this international context, it is natural for us to reflect on South Korea's position. While the South Korean government also emphasizes fostering the cloud industry and data security, a clear sovereign cloud strategy like Japan's has not yet been concretized. Although South Korea's data industry has become a vibrant arena where domestic and international global technology companies actively compete, it is necessary to meticulously examine whether systematic management is being carried out under state leadership and if there is a clear roadmap for securing data sovereignty. Japan's case presents a compromise that maintains cooperation with global cloud companies while rigorously protecting data and operational sovereignty. So
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