U.S. Investment Deal Advances as Security Talks Stall

U.S. President Donald Trump announces South Korea’s investment projects at the White House on Sept. 30, 2026. South Korea and the United States have confirmed the first concrete project under their $350 billion U.S. investment commitment, marking the beginning of economic cooperation implementation. Yet the core security issues that Seoul had hoped would follow as reciprocal benefits—including the acquisition of nuclear-powered submarines and the revision of the bilateral nuclear cooperation agreement—remain deadlocked. As progress in trade has yet to translate into momentum for security cooperation, analysts say the government’s negotiating strategy toward Washington is facing a critical test. On Oct. 1, the two countries designated a project to construct a gas-fired combined-cycle power plant in Encinal, Texas, with a total project cost of $22.3 billion, as the first strategic U.S. investment project. The government had expected that this investment would accelerate negotiations on long-delayed security issues, including the construction of nuclear-powered submarines and the expansion of uranium enrichment and reprocessing rights. The two sides, however, continue to address investment implementation and security issues through separate discussions. Amid a lack of progress in security negotiations, signs of strains between the two countries’ intelligence agencies have emerged. It has recently come to light that the National Intelligence Service was excluded, at the request of the U.S. side, from a working-group meeting on North Korean cyber threats held in Washington in June. It has also been reported that the United States has partially restricted intelligence sharing on North Korea since March, following remarks made by Minister of Unification Jeong Dong-young regarding North Korean nuclear facilities. The U.S. administration recently stated, with specific reference to intelligence and counterintelligence, that it “expects South Korea to uphold the standards of an alliance that has been maintained for decades.” This suggests that differences between the two countries’ intelligence agencies have raised questions about trust within the alliance. The National Intelligence Service and the Ministry of National Defense said there was no restriction on the overall volume of intelligence provided and that a solid state of military readiness was being maintained. The Alaska LNG project is another major economic issue between the two countries. U.S. President Donald Trump has said South Korea would invest more than $50 billion in the project and warned that costs would double if an investment agreement was not reached. South Korean officials conveyed to Alaska state legislators that investment could only be considered once commercial viability was established. The Alaska LNG project has long faced questions over its economic feasibility, as construction costs are more than twice those in other regions. The two countries still need to discuss the project’s investment terms and commercial viability in greater detail. Experts say a comprehensive recalibration of South Korea’s strategy toward the United States, integrating trade, diplomacy and security, is needed. Rather than addressing individual issues separately, they recommend coordinating economic cooperation and security discussions to achieve tangible results. In particular, discussions through high-level channels such as the Asia-Pacific Economic Cooperation (APEC) summit in November are expected to be an important opportunity to shape the future of South Korea-U.S. relations.