The United States and Japan have agreed to jointly develop and produce advanced weapons, including attack drones, a move that is rapidly reshaping the global defense industry. The partnership pairs U.S. technology with Japan’s manufacturing capacity, giving it the character of an industrial alliance as well as a military one. While it is framed as a supply-chain shift aimed at China, it could also affect South Korea’s defense exports.
The immediate goal is clear: to check China, which dominates the global drone market, and to adapt to changing battlefield conditions. In recent wars, drones have become core combat power rather than a supporting tool. Because they can be produced cheaply and deployed in large numbers, manufacturing capacity itself can translate into military strength. A division of labor in which the U.S. provides technology and Japan handles production is well suited to that shift.
The larger issue is that the partnership may go beyond replacing Chinese supply. By combining technology and production, the two countries aim to secure price competitiveness, quality and stable supply at the same time. If that is reinforced by alliance-based political trust, global defense procurement could be reorganized. For South Korea’s defense industry, which has already posted results in Southeast Asia and the Middle East, the risk of market erosion cannot be ruled out.
South Korea’s drone industry remains at an early stage. Exports are growing, but its global market share is still low. Its direct competitor is China, but over the medium to long term it is likely to face competition from an alliance-based supply chain led by the U.S. and Japan. South Korea’s defense sector, which has grown around finished weapons, could also come under pressure in “package export” competition. Once drones and other unmanned systems are integrated with existing weapons, the competitive field widens.
Still, the shift does not have to be viewed only as a threat. It can be a chance to reset strategy. Defense production is moving beyond hardware toward a systems industry that combines artificial intelligence, data and communications. Competition is expanding from airframes to software and platforms. If South Korea misses that transition, its current strengths may not last.
A response strategy needs to be clear. First, South Korea should separate short-term and medium- to long-term approaches. In the near term, it should protect export competitiveness by building on existing strengths and expanding real-world deployment of drones and unmanned systems. At the same time, it should focus on securing AI-based autonomous systems and data-integration capabilities. Speed and structural improvement must proceed in parallel.
Second, it should strengthen links to a U.S.-centered defense ecosystem. A stronger U.S.-Japan alliance does not necessarily mean South Korea will be excluded. With fast production capacity and maintenance experience, South Korea could find a complementary role. The key is not participation alone but securing differentiated areas, particularly in communications, security and software.
Third, it should push practical integration of civilian technology and defense production, which will require institutional change. Security rules should be maintained, but pathways should be created for private companies to participate. Opportunities for testing in constrained environments should be expanded, and technology development using defense data should be supported. The government should also make active use of advance purchases and test-bed programs to help early-stage technology firms enter the market. The need is for execution, not declarations.
Ultimately, the U.S.-Japan cooperation is a signal that defense competition is shifting from company-to-company rivalry to competition among national industrial alliances. The sector is being reorganized into a complex industry combining technology, production and diplomacy. If South Korea fails to keep pace, its current gains may not endure.
What is needed now is not simply a sense of crisis, but strategy and follow-through. South Korea’s defense industry has already shown its potential. The question raised by a U.S.-Japan drone partnership is straightforward: What position will South Korea hold in this new order? The answer will depend on prepared strategy and rapid execution.
* This article has been translated by AI.
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