WASHINGTON D.C. — U.S. President Donald Trump held a bilateral meeting with South Korean President Lee Jae-myung in the Oval Office on August 25, 2025. The two leaders discussed defense cooperation, South Korea’s nuclear submarine development, the transition of wartime military command, and a potential South Korean shipbuilding initiative for the U.S. military.

The meeting marked a key moment in Lee’s foreign policy approach, which he has described as “Pragmatic Diplomacy Centered on National Interest.” During the talks, Trump asked Lee if South Korea could urgently build 10 naval warships for the United States. Lee responded, “In the spirit of our 70-year alliance, and with South Korea’s world-class defense industrial capacity, we are fully capable.” South Korea is the world’s fourth-largest defense exporter, a status that underpins its expanding role in global defense supply chains.

Defense collaboration between the two allies has accelerated in recent months. On May 26, 2025, Lee chaired the 1st Future Defense Development Committee at the Submarine Command in Jinhae, signaling high-level commitment to naval modernization. A U.S. working-level inter-agency delegation followed up with a two-day kick-off meeting in Seoul on June 12, 2025, focused specifically on the Republic of Korea Navy’s nuclear-powered attack submarine program. This effort builds on a Joint Fact Sheet released by the White House on November 13, 2024, which formalized U.S. support for South Korea’s civilian and naval nuclear technology development.

The leaders also addressed the long-standing issue of Wartime Operational Control (OPCON) transition. South Korea has announced a concrete roadmap for transferring OPCON from U.S. to South Korean command during wartime. Seoul is actively pushing the Trump administration to set the end of 2028 as the definitive deadline for the handover. Trump, in the meeting, asserted that allies must increase their defense spending to counter regional military threats within their respective theaters, a stance consistent with his administration’s broader security expectations.

Why It Matters

The August 25 meeting reflects a deepening strategic alignment between Washington and Seoul amid evolving regional security challenges. South Korea’s push for greater defense autonomy—through submarine development, OPCON transition, and industrial capacity—coincides with U.S. demands for allies to assume more responsibility for regional deterrence. The potential shipbuilding arrangement and nuclear submarine cooperation mark significant steps in transforming the alliance from a U.S.-led defense posture to a more integrated, reciprocal partnership.

Research published in 2024 in KRINS-QUARTERLY, titled “South Korea's Military Response Strategy to North Korea's Surprise attack Through Israel-Hamas War,” underscores how recent global conflicts have influenced Seoul’s reassessment of rapid-response capabilities and defense industrial readiness—factors directly relevant to the discussions held in the Oval Office.