South Korea’s Push for Greater Military Independence Is a Double-Edged Sword
South Korea is being squeezed from several directions at once. Its alliance with Washington, once the fixed point around which the country’s national security policy was organized, has become a source of uncertainty. North Korea has abandoned unification as a state objective and has formally defined South Korea as a hostile state, as it deepens military and economic ties with Russia. China remains indispensable to Seoul economically, even as strategic competition between Beijing and Washington intensifies.
None of these trends are entirely new. What is new is the simultaneity of these pressures as they collide with a growing recognition in Seoul about the risks of overreliance on any one partner.
The clearest illustration came this month, when President Donald Trump ordered a substantial reduction in the annual Ulchi Freedom Shield exercises, cutting the 11-day drills to five days. As part of his rationale, Trump cited the cost of the drills, South Korea’s refusal to support the U.S. war in Iran, and his relationship with Kim Jong Un, describing the exercise as an inappropriate and hostile signal to Pyongyang.
Trump’s decision may have been abrupt, but it was not an isolated data point. During his first term, Trump raised tensions with his demands for Seoul to pay a higher share of the costs of U.S. bases in South Korea. At various points, he has also threatened to cut U.S. troop levels on the peninsula. And the U.S. decision earlier this year to relocate some missile defense assets from South Korea to the Middle East without prior consultation with Seoul raised alarms among South Korean officials. There have also been calls from administration officials for a broader U.S. Forces Korea role that extends beyond deterring North Korea and at containing China.
Seen against this backdrop, the scaling back of Ulchi Freedom Shield is less an aberration than a sharp instance of a longer trend in which Washington has expected allies to bear more of their own defense burden.
Nor is this simply a Trump problem. The president’s term is finite, and his successor may prove more accommodating toward U.S. allies. But from South Korea’s perspective, the underlying necessity to boost its self-reliance would remain regardless of who occupies the White House. North Korea’s capabilities continue to expand, and South Korea sits in a vulnerable geopolitical position, flanked by nuclear-armed neighbors and caught between intensifying U.S.-China competition. A friendlier administration in Washington would ease the immediate pressure but would not resolve the structural exposure that comes with relying so heavily on the choices of any single external patron.
As a result, President Lee Jae Myung’s government has already begun moving toward greater military independence. Under current alliance arrangements, operational control (OPCON) of South Korean troops would fall to a joint command led by a U.S. general in the event of another war on the peninsula. Talks to transfer that control to Seoul have been ongoing for decades, but Lee has reaffirmed his intention to complete the process before the end of his term in 2030. He has also called for accelerating the country’s nuclear-powered submarine program, and emphasized South Korea’s status as a major military and defense-industrial power. These intentions should not be mistaken for settled outcomes, however. The timeline for OPCON transfer has slipped before on both technical and political grounds, and the submarine program depends on continued U.S. cooperation that is not yet fully secured.
More importantly, greater military capacity does not automatically translate to greater strategic independence. Much of the conventional checklist—including OPCON transfer and the submarine program, as well as a stronger defense-industrial base—is already underway. The more consequential question is what greater self-reliance actually buys South Korea, and what new vulnerabilities it creates in the process. That answer could well become a double-edged sword.
To be sure, the opportunities are real. Greater military independence would reduce South Korea’s exposure to decisions made in Washington. It would shift the perception in Pyongyang of Seoul as a subordinate actor in its own defense, potentially strengthening South Korea’s hand in any future diplomacy with the North. It would raise the credibility of South Korea’s own deterrent, and with it, Seoul’s leverage over Pyongyang. Moreover, it would give South Korea a greater ability to resist coercion from larger powers and to shape the regional security environment rather than simply react to it. OPCON transfer is the clearest _expression_ of that opportunity, in that it represents the fullest symbol of Seoul taking back responsibility for its own security.
Still, this wouldn’t resolve the one gap South Korea cannot close on its own: It has no nuclear weapons, so coordination with Washington on how the U.S. nuclear umbrella would respond to a North Korean attack remains essential regardless of who controls conventional operations. Sustaining that coordination clearly and consistently across successive governments in Seoul is not a secondary detail but a condition for the strategy to work. Independent conventional capability only strengthens South Korea’s security if it stays calibrated against a nuclear guarantee it cannot provide for itself.
The more consequential question is what greater self-reliance actually buys South Korea, and what new vulnerabilities it creates in the process.
The same logic of opportunity paired with constraint applies to diplomacy. Reduced reliance on Washington creates space for South Korea to build a broader network of security partnerships, ones intended to reinforce the alliance rather than substitute for it.
This matters most in the Asia-Pacific, where Seoul could deepen cooperation with Japan, Australia and other regional partners around practical, defensive objectives: maritime domain awareness, missile defense, cybersecurity, intelligence sharing and protection of critical sea lanes. Notably, such deeper relationships would give Seoul additional capabilities and strategic options without necessarily requiring it to adopt the more explicitly China-focused posture that has characterized some of Australia’s regional diplomacy.
Australia’s own experience is instructive here. Canberra has used its extensive relationships with Pacific Island states to expand its diplomatic and strategic reach beyond its alliance with Washington. That model cannot simply be transplanted to Northeast Asia, but its underlying principle holds: A middle power increases its resilience by cultivating a network of partnerships rather than relying overwhelmingly on a single security guarantor.
Europe should form another part of this network for South Korea. European allies of the United States have faced similar pressure to assume more responsibility for their own security since Trump’s return to office, creating a degree of convergence with Seoul’s own position. South Korea already has deep diplomatic and economic ties with Europe and a growing defense-industrial relationship with countries such as Poland. But European states are themselves absorbed by rearmament and remain cautious about deeper Indo-Pacific commitments, and Seoul’s leverage there today runs almost entirely through defense exports. Turning that relationship into a genuine security asset, rather than a one-dimensional trade in arms, will require expanding cooperation into defense technology, cyber capabilities, intelligence and even maritime security.
Here again, Seoul does not need to choose sides in every regional dispute or build a coalition explicitly directed against any one major power. The goal should be partnerships that strengthen South Korea’s ability to deter aggression and respond to crises, not partnerships that expand the number of adversaries it must prepare to confront.
That is what makes greater military independence a double-edged sword. It gives South Korea greater agency, but also greater responsibility. It can reduce vulnerability to shifts in U.S. policy, but only if Seoul develops the doctrine, the manpower, and the partnerships needed to use that autonomy effectively. It can expand South Korea’s strategic options, but only if diversification stays disciplined enough not to trade dependence on one partner for entanglement with several others.
Handled with strategic discipline and a long-term horizon, however, the gains could outweigh the risks.
A South Korea capable of managing its own conventional defense, calibrated against a still-credible U.S. nuclear guarantee, and embedded in a wider network of partnerships across the Indo-Pacific and Europe would not only be more secure itself. It would become an active contributor to security beyond the peninsula and enhance regional stability rather than remain a variable dependent on the choices of a single ally.
Independence exercised carefully and strategically enough will strengthen the region it is meant to protect, rather than adding one more source of uncertainty to it.
Gabriela Bernal is an associated research fellow with the Institute for Security and Development Policy in Seoul, where she focuses on security and diplomacy on the Korean Peninsula. She holds a doctorate in North Korean studies and has previously worked at Korea Risk Group, Nikkei Asia and the United Nations.