On August 16, Trump abruptly commanded the Pentagon to “substantially” reduce joint military exercises between the US and South Korea (ROK). The annual Ulchi Freedom Shield, originally scheduled for eleven days, was subsequently relegated to a five-day exercise. By contrast, Freedom Edge 26 (exercises involving Japanese, American and South Korean troops) remains on track. The event is, according to the United States Forces Japan, the “premier trilateral, multi-domain exercise” and “our most advanced trilateral cooperation to date”. There is an apparent contradiction between the US-ROK bilateral exercise’s reduction, and the US-ROK-Japan trilateral exercise’s maintenance and rhetorical strengthening.
The Ulchi Freedom Shield is a US-ROK combined military defense exercise which is tied to preparation for defending the Korean Peninsula. The exercise helps with combined readiness, command procedures and operational interoperability. It is particularly important to South Korean perceptions of the US security guarantee; whether it is reliable, effective, compatible and so on. The trilateral Freedom Edge exercise has a maritime and air (multidomain) emphasis, focused on regional security cooperation. The two exercises have different strategic and political functions, thus the UFS and Freedom Edge are not seamless substitutes which can pick up each other’s slack and reduced duration without difficulty.
The first reading of the UFS-Freedom Edge juxtaposition is a continuity-based one. This reading would suggest that nothing fundamentally, ground-breakingly new is happening, but that Freedom Edge is just the latest iteration of the institutionalisation of US-ROK-Japan security cooperation. Camp David (2023) first institutionalised regular trilateral cooperation, and Freedom Edge has subsequently become a recurring exercise. The official language surrounding the 2026 event explicitly references the continuity and increasing sophistication of the partnership. While this reading explains why the exercises are happening, it fails to unravel the political significance of its occurence immediately after UFS’ abrupt retrenchment.
A second reading would see the reduction of the UFS as part of Trump’s renewed outreach to Kim Jong Un, and maintaining or expanding another major exercise risks undermining that outreach. Trump himself has explicitly described the UFS exercises as an inappropriate and hostile signal to North Korea. Across the ocean, North Korea continues to describe the exercises as threatening. Yet, this reading also fails to fully explain why the specific form of military cooperation reduced was the bilateral UFS, while the trilateral regional arrangement – arguably more threatening – continued.
Stay ahead of the geopolitical week.
MD Briefing delivers expert analysis across five global fronts — the Indo-Pacific, energy, geoeconomics, European security, and the Middle East — every Monday morning. Free.
The South Korean government was not informed in advance of Trump’s public announcement. Meanwhile, Trump is simultaneously signalling an intention to meet with Kim Jong Un. In terms of mixed messages, North Korea already knows that US forces remain capable of operating in the region, and Kim Yo Jong’s response to the UFS’ reduction suggested that Pyongyang did not regard the reduction in exercise duration as fundamentally transforming the underlying military threat. The politically important consequence of the UFS cut may be allied perceptions of American reliability, rather than North Korean perceptions of American hostility. Freedom Edge, then, can consequently be reinterpreted as a form of reassurance to Seoul and Tokyo. The bomber component of the exercises is important in this interpretation because strategic bombers have a particular association with US extended deterrence and power projection.
As an audience, South Korea is particularly important because the UFS is fundamentally embedded in the US-ROK bilateral defence relationship. Trump’s actions have demonstrated that the scale of the bilateral military engagement can be rapidly altered by a presidential decision. Seoul therefore has direct reason to question the reliability and predictability of US extended deterrence. Freedom Edge can help to reassure Seoul that a reduction in one component of the military alliance does not mean total abandonment, on the US’ part, of the security commitment.
Tokyo is also an important audience, since Japan has its own longstanding concerns about the credibility of US extended deterrence. Freedom Edge is an explicitly trilateral enterprise, thus Japanese security planners are watching both US regional commitment and the possibility of US accommodation with China/North Korea. A strong US-ROK-Japan exercise therefore demonstrates that Washington is still willing to invest in building regional coalitions. Freedom Edge is not an effort to replace a scaled-back UFS, rather it is signalling that the broader regional alliance architecture remains intact even if the bilateral US-ROK component of the architecture is increasingly conditional. For the US, as a military patron, it allows the state to pursue several objectives (DPRK diplomacy, ROK burden-sharing pressure, wider regional strategy) at the same time – while the client states are unable to easily do the same because their security dependence is greater.
Trump posted on August 16 that he had instructed Pete Hegseth (Secretary of War) to “substantially” reduce US-ROK exercises, calling them costly, inappropriately insulting to North Korea, and inconsistent with his “very good relationship” with Kim Jong Un. Crucially, he also referred to Seoul’s refusal to participate in US efforts concerning Iran. The South Korean government subsequently worked with the US military on how to implement the reduction. A possible third reading may combine the Iran-related-punishment and the seemingly-deferent compliance of Seoul and interpret the situation as symptomatic of increasing presidential unilateralism.
Kim Yo Jong (Director of the General Affairs Department of the Workers’ Party of Korea) dismissed the UFS reduction as not worth commenting on and not altering the exercise’s fundamentally hostile nature. She indicated she knew nothing of direct Trump-Kim communication, but carefully maintained the regime’s positive characterisation of the Trump-Kim relationship. In Pyongyang’s eyes, the reduction is not especially transformative, despite being characterised as an “apparent overture” to Kim Jong Un by The Guardian. Ten days after Trump’s announcement, North Korea launched around ten short-range ballistic missiles toward the sea – missiles which are banned under UN security council resolutions.
Trump explicitly stated that the exercises were hostile to North Korea, and that he values his relationship with its leader. Yo Jong, Jong Un’s influential sister, responded with disinterest and skepticism. Therefore, the immediate evidence doesn’t necessarily suggest that the reduction has made the US-DPRK especially strong, so one wonders who exactly this political decision is meaningful to; perhaps Seoul and Tokyo.
South Korea possesses no nuclear arsenal and thus relies heavily on its US alliance and extended US deterrence. US commitment to South Korean security is repeatedly communicated through troop presence, exercises, consultation, strategic assets and public commitments. The UFS demonstrates a practical ability for the two militaries to operate together, shows their joint readiness for attack and the extent to which the US commitment to South Korea has been institutionalised; that institutionalisation shows long-standing country-to-country commitment, not just the favour of particular leaders at particular times. By scaling back the UFS, Yoon Young-Kwan’s warning that “there may come a time when it is difficult to rely on the US for our security” may appear slightly prophetic, and the already lively debate surrounding South Korean nuclear latency may be pushed more in favour of the nation pursuing an independent nuclear capability.
Freedom Edge, at the same time, continues to demonstrate US regional commitment, trilateral enmeshing and deepening multilateral engagement. It cannot, however, fully replace the UFS (if the reductions are to continue) because UFS is directly concerned with US-ROK peninsula defence. The purpose of UFS cannot be neatly subsumed into Freedom Edge; therefore, the retrenchment of the former functions to reduce one, more acute form of reassurance while maintaining a broader regional commitment.
This pattern isn’t necessarily unprecedented. The history of the US-ROK alliance demonstrates that US adjustments to military commitments regularly generate questions about abandonment which then encourage greater South Korean interest in strategic autonomy. Military exercises have long operated as both deterrence mechanisms and diplomatic bargaining tools. Similar debates occurred during the Nixon and Clinton administrations, thus the significance of the 2026 iteration is the speed and sequencing of the process: a presidentially initiated reduction in a core bilateral exercise, followed by near-conspicuous maintenance of the wider security network. Washington appears to be reducing the risk of entrapment while managing the resulting risk of abandonment for its allies. Freedom Edge serves a compensatory function – while it cannot restore UFS’ specific peninsula defence, it can attempt to demonstrate the continued validity of US security commitments.
