South Korea’s preparations to send military assets to ensure the safety of maritime traffic in the Strait of Hormuz show that security cooperation among the US, Japan and South Korea extends beyond the Korean Peninsula. At the same time, the Freedom Edge exercise planned off Jeju Island is strengthening the trilateral security framework’s links with other strategic routes in Asia.
The trilateral framework moves beyond the Korean Peninsula
The Freedom Edge exercise, planned to be conducted by the US, Japan and South Korea off Jeju Island from September 7 to 11, demonstrates the operational level of security coordination among the three countries. Following the framework established at Camp David in 2023, the scope of the exercises has gradually expanded.
This year’s exercise is considered the most advanced example of trilateral cooperation to date. What distinguishes it is not only its scale but also its role in placing coordination among the US, Japan and South Korea on a more permanent and workable footing.
Seoul’s Strait of Hormuz option
South Korea is preparing to send a P-8A Poseidon maritime patrol aircraft, a logistics support vessel and a naval explosive ordnance disposal team to the Strait of Hormuz. While discussions continue over the scope of the mission and access to ports, no final decision has been made; the possible deployment is expected to be submitted to South Korea’s parliament for approval.
The plan is expected to focus on maritime surveillance, logistical support and navigational safety rather than direct combat engagement. This could allow South Korea to present its presence in the region as a contribution to maritime security rather than participation in a war.
South Korea’s inventory is believed to include six P-8A Poseidons, acquired primarily to monitor North Korean submarine activity. Sending some of the aircraft to the Persian Gulf could mean sharing capacity from Seoul’s core mission area.
The Strait of Hormuz and energy security
More than 60 percent of South Korea’s crude oil imports pass through the Strait of Hormuz. For this reason, keeping navigation through the strait uninterrupted is important to the country’s energy security.
However, South Korea’s preparations for the Strait of Hormuz cannot be explained solely by its energy needs. The acceleration of the preparations after messages from Washington linked Seoul’s position on the Iran issue to the future of military cooperation has raised questions about the influence of alliance ties on the decision.
The role Washington expects from its allies
The burden-sharing Washington envisions for its allies in Asia goes beyond increasing defense spending. This approach is expanding to include allies assuming responsibilities outside their immediate security environments.
Japan is considered to have experienced this shift earlier and more clearly. Japanese Prime Minister Sanae Takaichi’s linking of possible intervention over Taiwan to her country’s survival marks an important threshold in Tokyo’s postwar security outlook. Japan, however, can remain more cautious about sending warships to the Strait of Hormuz by emphasizing its constitutional and legal restrictions.
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 receptive to Washington’s demands beyond the region. At the same time, economic ties with China, parliamentary approval and public perceptions of security define 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 indicates that, alongside continued security ties with the US, more autonomous deterrence options are also finding support in society.
The emerging structure is viewed less as a new military alliance in the traditional sense than as a security network deepening through interoperability and taking on a stronger maritime focus. 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 more closely interconnected.
In the coming period, it will be important to see whether exercises such as Freedom Edge move beyond missile defense and North Korea-focused scenarios to address the protection of maritime transport routes. Japan’s and South Korea’s differing responses to this expansion, along with uncertainties over the future of the US security guarantee, are among the main factors that could shape the allies’ search for strategic autonomy.
