Trump's Last-Minute Exercise Cut Risks Turning South Korea-US Alliance Readiness into a Bargaining Chip

The South Korea-US alliance has been put to the test with US President Donald Trump's last-minute decision to reduce the Ulchi Freedom Shield exercise.

Hours before the exercise began, Trump ordered the Pentagon to "substantially reduce" the exercise, citing its cost and the need to send a more positive signal to North Korea. However, the exercise went ahead as scheduled, with the Pentagon offering no public explanation of what would be cut.

The ambiguity surrounding the exercise's reduction has raised concerns about the readiness of the South Korea-US alliance. A recurring combined exercise, developed through months of bilateral planning against a nuclear-armed adversary, was recast overnight as an instrument of presidential diplomacy and leverage over an ally.

## The Last-Minute Reduction

Ulchi Freedom Shield is an 11-day combined exercise involving about 18,000 South Korean personnel. It integrates computer-assisted command-post training with field exercises and incorporates lessons from recent wars, including drone operations, GPS disruption, and cyberattacks.

Because the order arrived only hours before the exercise began, canceling or redesigning the command-post phase would create more disruption than savings. The likelier near-term options are narrower U.S. participation, fewer supporting assets, or reductions in field events that have not yet occurred.

However, the value of Ulchi Freedom Shield cannot be counted only in troops or field events. It rehearses the machinery that would allow two national militaries to operate as one force in a crisis: command relationships, intelligence flows, reinforcement, logistics, missile defense, and civil-military coordination.

| Exercise | 2025 | 2026 | | --- | --- | --- | | Number of field exercises | 17 | 14 | | Number of South Korean participants | - | - |

## The Risk of Seoul Being Sidelined

Trump has done this before. After the 2018 Singapore summit with Kim Jong Un, Trump surprised both South Korean and U.S. military officials by announcing the suspension of major exercises. The pause created space for diplomacy with North Korea, but it also produced a measurable degradation in combined-force readiness.

The current strategic setting is less favorable than it was in 2018. North Korea has deepened military cooperation with Russia, and Pyongyang continues to improve its missiles. Just before Ulchi Freedom Shield, North Korea threatened to strengthen its nuclear deterrent in response to the exercise.

## Restoring Joint Control of Alliance Decisions

Seoul should avoid both a public confrontation with Trump and passive acceptance of an undefined order. The immediate priority is a joint political and military review that clarifies which activities are affected and protects the essential command-post functions, the operational control assessment, and training involving critical U.S. enablers.

The two governments also need rules for future exercise adjustments. Any change intended to advance diplomacy should be jointly decided, time-limited, reversible, and linked to observable North Korean action. Exercise policy should remain separate from trade disputes and requests for South Korean participation in operations outside the peninsula.

For its part, South Korea should continue strengthening independent intelligence, command-and-control capabilities, and conventional military capabilities, while also accepting a larger role in deterring North Korea. A sustainable demand for allies to take greater responsibility for their own defense is only sustainable when paired with reliable U.S. support and predictable consultation.