Japan-South Korea naval drills resume with joint search-and-rescue exercise off Goto Islands
Japan-South Korea naval drills resumed on June 7, 2026, when the Japan Maritime Self-Defense Force and the Republic of Korea Navy conducted a joint search-and-rescue exercise west of the Goto Islands. The Japan-South Korea naval drills marked the first such bilateral maritime manoeuvre in nine years and focused on interoperability in rescue operations and tactical data exchange.
First joint rescue drill in nine years
The exercise on June 7 brought together a JMSDF Aegis destroyer and an SH-60K helicopter alongside a South Korean landing ship from the Chunwangbong class. The drill, conducted in waters west of the Goto archipelago, concentrated on search-and-rescue procedures while also testing communications and airborne operations.
Japanese officials described the manoeuvre as a symbolic restart of defence cooperation that had been largely frozen since a December 2018 incident involving a dispute over radar targeting. That breakdown halted most bilateral exchanges and left a gap in routine defence coordination between Tokyo and Seoul.
Assets deployed and training activities
Japan deployed the destroyer Kongo, equipped with an Aegis combat system, and an SH-60K helicopter for flight operations from the ship’s deck. South Korea sent a Chunwangbong-class landing ship to participate in sea and air coordination drills.
Training modules included cross-platform communications for tactical data sharing, helicopter operations from both ships, aerial reconnaissance photography and coordinated search patterns. Planners said these elements were intended to raise practical interoperability beyond purely humanitarian missions.
Diplomatic steps that led to resumption
Officials point to a diplomatic thaw in 2024 that set the stage for renewed military engagement, culminating in a ministerial meeting in Yokosuka in January 2026. At that meeting defence ministers agreed to resume the SAREX-style drills and to explore regular ministerial talks and cooperation in areas such as artificial intelligence, unmanned systems and space.
Japanese Defence Minister Shinjirō Koizumi hailed the exercise as “the start of a new chapter” in bilateral defence ties, and he is expected to travel to Seoul later in June 2026 to continue discussions with his South Korean counterpart.
Security drivers behind deeper coordination
While both governments publicly cite the advanced nuclear and missile programmes of North Korea as the primary driver of security cooperation, broader regional dynamics have also factored into the decision to strengthen ties. Observers say expanded Chinese naval activity in the East and South China Seas and uncertainty about the future contours of U.S. commitments in the region have motivated closer Tokyo–Seoul coordination.
Official statements released in January 2026 avoided naming any single external power, instead pointing to a “deteriorating security environment,” but analysts note structural pressures that make closer maritime coordination strategically attractive for both capitals.
Domestic sensitivities in South Korea
Despite the operational rationale, political and historical sensitivities in South Korea remain a significant obstacle to deeper integration. In a June 8 press conference marking his first year in office, President Lee Jae-myung acknowledged the practical necessity of logistics-sharing agreements such as the Acquisition and Cross-Servicing Agreement (ACSA), yet he conceded that public sentiment still finds such ties difficult to accept emotionally because of the legacy of Japan’s colonial rule.
That tension helps explain why ostensibly routine administrative arrangements can become focal points of domestic debate in Seoul, constraining the pace and scope of military interoperability even as both governments pursue closer ties for strategic reasons.
Implications for regional maritime operations
Resuming Japan-South Korea naval drills restores a baseline of cooperation that could improve coordination in incidents at sea, humanitarian responses and multilateral operations. Enhancing tactical data sharing and cross-deck helicopter operations increases practical options for joint action in contingencies ranging from search-and-rescue to maritime security patrols.
However, experts warn that durable defence cooperation will require sustained political backing, transparent public outreach in South Korea, and careful management of regional perceptions to avoid escalation or misinterpretation.
The June 7 exercise demonstrates a measured, step-by-step approach to rebuilding trust and operational capability between two key U.S. allies in East Asia. It also signals a willingness on both sides to reconnect defence channels after a prolonged hiatus.
The renewed Japan-South Korea naval drills are likely to be followed by further ministerial meetings and working-level exchanges through the summer, as Tokyo and Seoul seek to translate diplomatic agreements from 2024 and January 2026 into routine, confidence-building military cooperation.