South Korea’s preparations to send military assets to the Strait of Hormuz are bringing the dimension of security cooperation between the United States, Japan and South Korea beyond the Korean Peninsula into focus. The Freedom Edge exercise planned off Jeju Island also stands out as a reflection of trilateral coordination in a different theater.
The trilateral framework becomes operational
The Freedom Edge exercise planned by the United States, Japan and South Korea off Jeju Island from September 7 to 11 demonstrates how the three countries’ security commitments are being translated into action. Following the framework established at Camp David in 2023, the scope of the exercises has gradually expanded.
The exercise planned for this year is described as the most advanced demonstration of trilateral cooperation to date. Its significance is attributed not only to its scale but also to its role in moving security coordination toward a more permanent and workable foundation.
South Korea’s Hormuz plan
The Seoul government is preparing to send a P-8A Poseidon maritime patrol aircraft, a logistics support vessel and a navy explosive ordnance disposal team to the Strait of Hormuz. While discussions continue over the scope of the mission and access to ports, a final decision has not yet been made, and the possible deployment will be submitted to the South Korean parliament for approval.
The mission is expected to focus on maritime surveillance, logistical support and navigational safety rather than direct combat engagement. This approach could allow South Korea to present its presence in the region not as participation in a war but as a contribution to the safety of maritime transportation.
South Korea is believed to have six P-8A Poseidon aircraft in its inventory, acquired primarily to monitor North Korean submarine activity. Sending some of these aircraft to the Persian Gulf could mean that Seoul is sharing capacity from its primary area of responsibility.
The energy route and Washington’s expectations
More than 60 percent of South Korea’s crude oil imports pass through the Strait of Hormuz. Ensuring that navigation through the strait is not disrupted is therefore important to the country’s energy security.
However, the preparations for Hormuz cannot be explained solely by energy security. The acceleration of preparations after messages from Washington linking Seoul’s position on Iran to the future of military cooperation raises the question of how alliance ties are influencing the decision.
The burden sharing the United States expects from its allies in Asia is expanding beyond requiring countries to allocate more resources to their own defense to include participation in responsibilities outside their immediate security environments.
This shift is considered to have emerged earlier and more clearly in Japan. Japanese Prime Minister Sanae Takaichi’s linking of a possible intervention involving Taiwan to her country’s survival points to a significant threshold in Tokyo’s postwar security outlook. By contrast, Japan can maintain a more cautious position on sending warships to the Strait of Hormuz by emphasizing its constitutional and legal constraints.
The absence of a similar constitutional restriction in South Korea, together with the requirement for parliamentary approval of any possible deployment, could make Seoul more open to Washington’s demands beyond the region. At the same time, economic relations with China, parliamentary approval and domestic perceptions of security set the limits of that openness.
Seoul’s search for strategic autonomy
Support for nuclear armament in South Korea is said to have reached approximately two-thirds. This picture indicates that, while security ties with the United States continue, more autonomous deterrence options are also finding support in society.
The emerging structure is viewed not as a new military alliance in the classic sense but as a security network deepening through interoperability, with its maritime dimension growing stronger. Treating the Korean Peninsula, the Taiwan Strait and the Strait of Hormuz as part of the same strategic line shows that regional security calculations are becoming increasingly interconnected.
In the coming period, it will be important to see whether exercises such as Freedom Edge expand from missile defense and North Korea-focused scenarios toward protecting maritime transport routes. The different responses Japan and South Korea give to this expansion, along with uncertainties over the future of the US security guarantee, are among the main factors that could shape the allies’ pursuit of strategic autonomy.
