2021年，日本在太空、网络及电磁频谱等高边疆安全领域加大安全经费投入、调整太空重点事项建设，发布新版《网络安全战略》报告，加强完善高边疆领域体制建设及安全能力建设，增强跨域作战能力，持续深化高边疆安全战略以维护和扩大日本的高边疆安全利益。当前，日本高边疆安全战略发展呈现与经济安全关联，强调与美国、欧洲、北约、印度等盟国和伙伴国的安全合作，重视“产学官”领域协同、突出“官民”协作等特点。日本高边疆安全战略将增强新领域内的军事能力和进攻倾向，并将在美国的对外作战中扮演更重要的角色和发挥更大的作用，有明显的对华针对性。日本在高边疆安全领域追求的竞争性与对抗性不利于地区安全，需要警惕。
In 2021，Japan increased space security investment in high-frontier security fields such as space，cyberspace and electromagnetic spectrum，adjusted the construction of key space matters，issued a new version of the cyberspace security strategy report，strengthened and improved the system construction and security capability construction in high frontier fields and enhanced cross-domain combat capability，with the aim to safeguard and expand Japan’s high-frontier security interests. Currently，the development of Japan’s high-frontier security strategy reflects its relationship with economic security，emphasizes security cooperation with allies and partners such as the U.S.，EU，NATO and India，attaches importance to the coordination among government，enterprises and research institutes and highlights the public-private cooperation. Japan’s high frontier security strategy will enhance its military capability and offensive tendency in new fields. With the further deepening of Japan-U.S. high-frontier security cooperation，Japan will still play a more important role in the overseas military operations of the U.S.. The competitiveness and aggressiveness of Japan in strengthening its high-frontier security pose negative impact on the regional security and should be vigilant.
