Currently，with the prolonged development of the Ukraine crisis and profound changes in the international order，the U.S. is pushing its Asia-Pacific allies to provide more help for its “Indo-Pacific strategy”，Japan is seeking to develop its strategic autonomy by cooperating with the United States to curb China，and the Republic of Korea is attempting to enhance the strategic environment for the maintenance of national security. As a result，the trend of “bloc confrontation” in Northeast Asia has intensified，driven by the strategic needs of the U.S.，Japan，and the Republic of Korea. In 2023 The exchange of visits between South Korean President Yoon Seok-yul and Japanese Prime Minister Fumio Kishida，and the resumption of shuttle diplomacy between the two countries after a 12-year hiatus，has opened the way for the restructuring of Japan-the Republic of Korea relations and the improvement of the relationship between the two countries，which opens a new chapter for the adjustment and improvement of Japan-the Republic of Korea relations. In the context of the convergence of the restructuring of Japan-the Republic of Korea relations and the U.S. strategy to contain China，Japan and the Republic of Korea’s negative policy toward China will be enhanced，but the future outlook for Japan-the Republic of Korea relations are still faced with a number of serious challenges，Japan-the Republic of Korea bilateral relations endogenous limitations can not be overcome，and the two countries’ “positive cooperation” is difficult to produce a “deep alliance “The “asymmetric relationship” between the U.S.，Japan and the Republic of Korea will continue to influence the evolution of Northeast Asia and the neighboring security environment.