
U.S. President Donald Trump gives an address, alongside Vice President JD Vance, left, Secretary of State Marco Rubio, third from left, and Secretary of Defense Pete Hegseth, at the White House in Washington, D.C., June 21, following the announcement that the U.S. bombed nuclear sites in Iran. Yonhap
The United States’ recent call for allies, including South Korea, to raise defense spending to 5 percent of gross domestic product (GDP) has sparked concern and debate. U.S. Secretary of Defense Pete Hegseth, during a congressional hearing, described the 5 percent mark as a new “standard” for all allies. A Pentagon spokesperson later confirmed that Asian partners, like their European counterparts, should move toward this benchmark to help ensure regional stability.
This proposal continues Washington’s long-standing push to rebalance global defense spending, a policy that gained momentum under President Donald Trump. While there is merit in encouraging stronger defense posture among allies — especially amid growing global threats such as Russia’s aggression, China’s military expansion and North Korea’s advancing weapons programs — the imposition of a uniform spending metric across vastly different regions is both unrealistic and counterproductive.
South Korea is not a passive recipient of American defense support. It is a pivotal regional actor with one of the world’s most advanced and self-reliant militaries. Currently spending about 2.4 percent of its GDP on defense — significantly more than many other U.S. allies — Korea plays a central role in preserving peace and stability in Northeast Asia. It hosts 28,500 U.S. troops, engages in high-level joint military exercises, contributes to regional deterrence and supports nonproliferation efforts. Its growing footprint in global defense industries and strategic supply chains further underlines its value to shared security.
Doubling defense spending to meet the 5 percent demand would place a significant strain on Korea’s fiscal resources. At a time when the country faces pressing challenges in economic resilience, aging demographics and the need for sustained investment in social welfare, significant increases in defense spending could erode public support and undermine national priorities. Spending should increase in a realistic and sustainable manner that aligns with Korea’s broader strategic and domestic needs.
Moreover, the U.S. must avoid viewing its alliance with Korea through a purely transactional lens. Unlike NATO, where common defense goals and spending targets are embedded in a multilateral framework, the Indo-Pacific region comprises a web of bilateral alliances, each shaped by distinct histories, geographies and threat perceptions. Applying a NATO-style standard to a region as diverse as Asia risks oversimplifying its complex security architecture.
South Korea must approach the defense cost dialogue with strategic clarity and diplomatic firmness. Any move toward increased defense spending must be matched by corresponding U.S. commitments in the form of enhanced strategic consultation, expanded technology sharing and deeper cooperation on nuclear deterrence, including revisiting the Korea-U.S. nuclear agreement.
The Trump-era approach emphasizes short-term financial contributions over long-term strategic cooperation. Should this transactional mindset dominate, Korea must assert its position as a sovereign, capable partner, not a client state. In such a scenario, Seoul should insist on a comprehensive framework that ties any defense budget increases to tangible U.S. commitments in joint operational planning, strategic deterrence and access to cutting-edge military technologies. This approach will help insulate the alliance from short-term political fluctuations and reaffirm its long-term strategic value.
Beyond military cooperation, the Korea-U.S. alliance can also be strengthened through deeper industrial and technological collaboration. In areas such as shipbuilding, cybersecurity, artificial intelligence and advanced defense manufacturing, Korea’s industrial capabilities align well with Washington’s goal of securing global supply chains and revitalizing domestic industries.
Ultimately, the strength of the Korea-U.S. alliance should rest not on imposed spending metrics, but on shared values, strategic trust and a mutual commitment to regional peace. Both countries must work together to shape a balanced, future-oriented alliance — one that respects sovereignty, reinforces strategic cooperation and adapts to evolving global challenges.