South Korea, Japan, and the EU now face four converging challenges and pressures.
The first is demographic. South Korea is aging faster than any other OECD society; Japan’s working-age population has been shrinking for decades; and the EU’s fertility rate reached a new low in 2024. Demography is not a social-policy sidebar. It affects defense recruitment, industrial capacity, fiscal room, technological adoption, and the ability to sustain long-term commitments. Each actor is experimenting with immigration, automation, workforce policy, and welfare reform, but the security implications remain largely compartmentalized.
The second is concentrated economic dependence. None of the three can or should decouple from China. Yet South Korea’s experience after the THAAD deployment, Europe’s debates over economic coercion, and China’s export controls on gallium, germanium, and other strategic inputs have shown that interdependence can be converted into leverage. De-risking therefore requires more than national stockpiles. It requires shared risk maps, compatible certification, co-investment in alternative suppliers, and advance consultation before export controls or industrial subsidies create collateral damage among partners.
The third challenge is U.S. volatility. The United States is still the only actor capable of providing extended nuclear deterrence to South Korea and Japan, and NATO remains central to European defense. But dependence on U.S. power now coexists with uncertainty about U.S. policy. The classic alliance dilemmas of abandonment and entrapment are no longer opposite ends of a spectrum. Today, U.S. allies fear both being left out and being drawn into bargains or contingencies they did not shape.
The fourth pressure is the collapse of the old geographic separation between European and Asian security. North Korean munitions, missiles, and troops have supported Russia’s war against Ukraine. Moscow, in turn, has provided Pyongyang with political cover, economic support, and the prospect of military know-how. What happens on a European battlefield is changing the military balance on the Korean Peninsula. A regional response to a cross-regional threat is structurally inadequate.
This is the case for an EU-Japan-South Korea strategic dialogue. This framework should not be described as strategic autonomy, equidistance, or a hedge against the United States. A better term would be institutionalized hedging: risk diversification through standing, rule-based consultation among allies and partners that remain anchored in the broader U.S.-led system.
The proposal is more feasible than ever before. Japan-South Korea relations have improved significantly in recent years. The January 2026 summit in Nara and the reciprocal summit in South Korea in May demonstrated continuity across leadership changes in both countries since June 2025. The EU already has free-trade, digital, green, and security frameworks with both countries. The task is not to invent three new bilateral relationships; it is to connect existing ones.
The dialogue should begin modestly, through a Track 1.5 process involving officials, experts, and industry. Its early agenda must be concrete and specific: a joint critical minerals and supply chain risk assessment; consultation on export controls and investment screening; cooperation on AI, cyber resilience, and digital standards; exchanges on demographic and defense workforce adaptation; and shared monitoring of North Korea-Russia military cooperation. Successful projects could then be elevated to ministerial working groups.
Two design choices are essential. First, the initiative must remain function-driven. It is not NATO, not the Quad, and not an anti-China coalition. Its purpose is to reduce vulnerability without demanding economic separation. Second, it should be complementary to relations with Washington and transparent about that purpose. Horizontal networks strengthen alliances when they help allies absorb shocks, coordinate positions, and arrive at consultations with greater capacity.
For South Korea, the need is particularly acute. Japan already has the G7, a mature economic partnership with the EU, and expanding European defense ties. Seoul’s international weight has grown faster than its institutional depth. An EU-Japan-South Korea dialogue would help close that gap.
Horizontalizing alliances is not a vote of no confidence in the United States. It is insurance for the moments when the United States wavers, overreaches, or changes course. The postwar hierarchy cannot simply be preserved by demanding more reassurance from Washington. Its resilience will depend on whether allies can build connective tissue among themselves before the next crisis forces them to improvise.
