On June 7, the Japan Maritime Self-Protection Drive (JMSDF) and the Republic of Korea Navy (ROKN) performed a search and rescue train (SAREX) west of Japan’s Goto Islands, marking the primary such drill between the 2 navies after a nine-year hiatus.
The train concerned the Kongo-class Aegis destroyer JS Kongo (DDG-173) and an SH-60K helicopter on the Japanese aspect, whereas the ROK Navy deployed ROKS Cheon Ja Bong (LST-689), a Cheon Wang Bong-class tank touchdown ship. Along with search and rescue operations, the drill included a hyperlink train (LINKEX) for tactical knowledge sharing between ships and plane, cross-deck helicopter operations, and a photograph train (PHOTOEX) — parts that construct the form of interoperability relevant nicely past humanitarian missions.
The JMSDF stated the train improved search and rescue capabilities and strengthened cooperation between the 2 sides.
The resumption carries appreciable symbolic weight. Bilateral protection ties collapsed after a South Korean destroyer allegedly locked its fire-control radar onto a JMSDF P-1 maritime patrol plane in December 2018, triggering one of many worst crises in postwar Japan-South Korea protection relations. Exchanges have been successfully frozen for years.
A turning level got here on the 2024 Shangri-La Dialogue, when the 2 protection ministers agreed on measures to stop a recurrence. The January 2026 Yokosuka ministerial assembly then formalized the resumption of SAREX alongside agreements to carry annual protection ministerial conferences and discover cooperation in synthetic intelligence, unmanned techniques, and area.
Japanese Protection Minister Koizumi Shinjiro described the train as “the start of a brand new chapter” in bilateral protection cooperation and is anticipated to go to Seoul later this month for additional talks.
The broader strategic backdrop is troublesome to disregard.
North Korea’s advancing nuclear and missile capabilities stay the acknowledged focus of bilateral safety cooperation. However China’s increasing naval presence throughout the East China Sea, South China Sea, and waters round Taiwan, mixed with rising uncertainty over future U.S. alliance commitments, has created further incentives for Tokyo and Seoul to deepen coordination.
Neither authorities names China in official paperwork — the January 2026 joint assertion refers solely to “the more and more extreme safety setting” — however the structural pressures are evident. As Japanese Prime Minister Takaichi Sanae and South Korean President Lee Jae-myung moved to stabilize bilateral relations in Could, uncertainty over Washington’s future regional position offered a further incentive for nearer coordination.
But the identical week that SAREX made headlines, Lee supplied a strikingly candid reminder of how far the connection nonetheless has to journey.
Talking at a press convention marking his first yr in workplace on June 8, Lee acknowledged that an Acquisition and Cross-Servicing Settlement (ACSA) — which might permit the JSDF and ROK army to change gas, meals, and provides — has “sensible necessity.” However he added that it’s “presently troublesome for the general public to just accept this emotionally,” citing the legacy of Japanese colonial rule.
“We have been crushed prior to now,” he stated. “Individuals really feel — even when we have to get alongside now, can we actually totally cooperate?”
The frankness is value noting.
ACSA is, in operational phrases, a modest administrative association — basically a reimbursement mechanism for logistics help. Japan signed an identical settlement with Australia in 2010 with out vital controversy. However within the South Korean political context, it’s fraught with historic symbolism, functioning as a proxy debate concerning the limits of Japan-ROK army integration.
Specialists at a latest public seminar held at Keio College in Tokyo famous the hole. One Japanese analyst described ACSA as “not more than a billing process,” whereas a Korean researcher referred to as it “a politicized agenda,” arguing that after the difficulty grew to become politicized, concluding the settlement grew more and more troublesome no matter its sensible deserves.
This hole between strategic logic and home political constraint defines the central rigidity in Japan-ROK protection relations at this time.
The safety case for nearer cooperation is stronger than it has been in a long time. North Korea’s nuclear and missile capabilities proceed to advance, whereas Pyongyang’s rising army partnership with Russia and China’s renewed efforts to strengthen ties with North Korea have added a brand new layer of complexity to Northeast Asia’s safety setting.
Japan has overhauled its protection posture, eased restrictions on arms transfers, and is actively in search of safety companions. South Korea, in the meantime, has constructed considered one of Asia’s most succesful protection industries. The complementarities are actual.
And but historical past doesn’t merely yield to strategic calculation. Lee’s feedback counsel a pacesetter who understands the safety rationale however can’t transfer sooner than his political base permits.
The resumption of SAREX illustrates how far bilateral protection cooperation has recovered since 2018. The persevering with controversy surrounding ACSA demonstrates that normalization just isn’t the identical as strategic integration.
Whether or not the connection can finally advance from symbolic normalization to substantive strategic cooperation will rely not solely on the regional safety setting, however on the power of political leaders in each nations to handle the enduring weight of historical past. For now, the return of SAREX demonstrates that sensible cooperation is shifting forward, even when political reconciliation stays incomplete.
