Enhanced Regional Defense
South Korea, Japan Boost Defense Ties, Eye AI and US Alignment for Regional Stability
Key Points
The Black Eagles conducted a first stopover at the Japan Air Self-Defense Force's Naha base in Okinawa on Jan 28 for refueling, and exchanges are expected to continue rather than being a one-off; there is currently no regular refueling arrangement established.
Defense ministers Ahn Gyu-back and Shinjiro Koizumi have held six meetings, indicating sustained, regular high-level dialogue between South Korea and Japan.
The talks explicitly referenced trilateral cooperation with the United States as part of broader regional security arrangements.
Naval ties were strengthened with the revival of a joint search-and-rescue exercise (SAREX) earlier this month, marking the first such exercise in nine years since 2017.
South Korea and Japan's defense chiefs met in Seoul on June 28, 2026, pledging deeper military ties — from AI research to joint sea rescues. It was the first visit by a Japanese defense minister to the South Korean capital in 11 years, according to The Japan Times.
The two ministers, Ahn Gyu-back and Shinjiro Koizumi, had already met five times before this visit — a record pace of contact. But one big item was missing from their joint statement: the Acquisition and Cross-Servicing Agreement, a military logistics pact Japan has long sought, according to The Korea Herald.
Nine Years of Silence Broken at Sea and in the Air
The talks capped a rapid stretch of military firsts. On June 7, 2026, South Korea and Japan held their first joint Search and Rescue Exercise — known as SAREX — in nine years, according to Naval News. The last one was in 2017. The two navies met near Japan's Goto Islands. Beyond basic rescue drills, the exercise included "LINKEX" and "PHOTOEX" components, letting the two fleets share real-time tactical data for the first time in nearly a decade.
In the air, South Korea's Black Eagles aerobatic team made their first-ever refueling stop at Japan's Naha Air Base in Okinawa on January 28, 2026, according to Korea JoongAng Daily. Pilots from the Black Eagles and Japan's Blue Impulse team held an exchange event on the ground. No regular refueling arrangement is in place yet, but both sides expect the stopovers to continue.
AI and Technology Push Bypasses Historical Baggage
The joint statement put a spotlight on advanced science and technology — specifically artificial intelligence. Analysts at the Center for Strategic and International Studies say that bilateral AI commitments like this one usually come before "interoperable standards and joint procurement frameworks," according to The Japan Times. In plain terms: agreeing on AI cooperation now paves the way for the two militaries to buy and use compatible weapons systems later.
Experts say the AI focus is deliberate. It is forward-looking and avoids the historical disputes — like a 2018 radar lock-on incident between a South Korean warship and a Japanese patrol aircraft — that froze ties for years. Both countries also see joint AI development as a way to compete with China's fast-growing military technology, according to Anadolu Agency.
The Missing Logistics Pact and Why Seoul Left It Out
The biggest absence in the joint statement was the Acquisition and Cross-Servicing Agreement, or ACSA. An ACSA would let the two militaries share fuel, ammunition, and supplies during operations. Japan has pushed hard for it. But South Korean President Lee Jae-myung said on June 8 that while the pact has "practical need," it is "emotionally difficult" for South Koreans to accept, according to The Korea Herald.
Many South Koreans are wary of any deal that could allow Japanese forces to operate near the Korean Peninsula. Opposition lawmakers in Seoul have been especially critical. Researchers note the omission was a calculated move to protect President Lee from "pro-Japan" accusations ahead of upcoming legislative reviews — even as actual military cooperation is at its highest level since the 1990s.
What Is Driving the Rapprochement — and What Comes Next
Three forces are pushing South Korea and Japan closer. First, North Korea keeps expanding its nuclear program and is now working militarily with Russia, according to Reuters. Second, Washington has pressed both allies to deepen ties as part of a broader Indo-Pacific strategy. Third, both nations need each other to keep up with China's rapid military build-up. Japan is already boosting its defense budget to 9 trillion yen — moving toward 2% of GDP — under Prime Minister Sanae Takaichi.
Koizumi called the revival of joint drills the "beginning of a new chapter." The next milestone to watch is the ACSA. President Lee's admission that the pact has "practical need" hints that quiet, technical talks may already be happening behind the scenes, according to The Korea Herald. Meanwhile, the Black Eagles and Blue Impulse are expected to move from one-off stopovers toward a regular refueling arrangement — giving both governments a visible, crowd-pleasing symbol of cooperation.
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