Key Points
South Korea needs military supply agreement with Japan for regional security.
Public sentiment and colonial history block deal despite strategic necessity.
Defense ministers discussed ACSA on May 31, first official talks since Lee took office.
Japan and South Korea held first joint naval exercise in nine years on June 7.
South Korean President Lee Jae Myung publicly acknowledged the need for a military supply agreement with Japan but said his country cannot sign it due to public sentiment and unresolved historical grievances. At a press conference marking his first year in office on June 9, Lee revealed he told Japanese Prime Minister Sanae Takaichi that an Acquisition and Cross-Servicing Agreement (ACSA) remains impractical despite its strategic value.
What the ACSA Agreement Does
An ACSA allows two countries to share military supplies and logistical support, including fuel, food, and ammunition. Japan has sought this agreement with South Korea to strengthen defense ties against threats from China and North Korea. The two nations came close to signing an ACSA in 2012, but strong public criticism in South Korea blocked the deal.
Why South Korea Refuses to Sign Now
Lee said public sentiment makes an agreement difficult to conclude. He told Takaichi that he would face criticism at home if he pursued military cooperation with Japan. Lee pointed out that many South Koreans believe Japan has not sincerely apologized for its 1910-1945 colonial rule of Korea. He likened the situation to a man being punched and hospitalized, then asked by his attacker to move on without a genuine apology.
Signs of Warming Ties Despite the Impasse
South Korea and Japan held their first naval search and rescue exercise in nine years on June 7, marking a thaw in relations. On May 31, South Korean Defense Minister Ahn Gyu-back discussed an ACSA with his Japanese counterpart, Shinjiro Koizumi. The exercise reflected strategic convergence between the two nations, though history continues to cast a shadow over deeper military cooperation.
Lee’s Condition for Future Cooperation
Lee said Japan must offer a sincere apology for colonial rule before South Korea can pursue genuine military cooperation. He stated that historical issues must be fundamentally resolved for a real Korea-Japan relationship to develop. Lee expressed confidence that such a day would eventually come, but made clear it is not now.
Final Thoughts
South Korea’s military agreement with Japan remains blocked by public sentiment and historical grievances, not strategic necessity. Lee’s public acknowledgment signals openness to future talks, but only after Japan addresses colonial-era apologies.
FAQs
ACSA enables two countries to share military supplies like fuel and ammunition during operations. Japan seeks it to strengthen defense cooperation against regional threats.
Public opposition in South Korea halted the agreement. Citizens opposed military cooperation with Japan due to unresolved historical grievances from colonial rule.
South Korea demands Japan apologize sincerely for its 1910-1945 colonial occupation. President Lee states this apology must precede deeper military cooperation.
Disclaimer:
The content shared by Meyka AI PTY LTD is solely for research and informational purposes. Meyka is not a financial advisory service, and the information provided should not be considered investment or trading advice.
About Author

Huzaifa Zahoor
Co FounderHuzaifa Zahoor is the engineer who built Meyka. He has spent years writing Python, training AI models, and building data pipelines specifically for financial markets. His technical articles have reached over 30,000 readers on Medium, so he knows how to make complex things easy to follow. If this article touches on how the tools work, he is the person who actually built them.
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