South Korea, Japan and US to hold nuclear missile drill focused on North Korea

South Korea, Japan, and the United States are gearing up for a joint nuclear missile defense exercise scheduled for September 9-11, 2026. The drill, dubbed Freedom Edge, will take place in international waters south and east of Jeju Island, and it’s aimed squarely at sharpening the three nations’ ability to counter North Korean missile and nuclear threats.

South Korea’s Joint Chiefs of Staff announced the exercise on August 28, framing it as defensive in nature. Given that North Korea lobbed approximately 10 short-range ballistic missiles around August 20, “defensive” is doing some heavy lifting but isn’t inaccurate.

What Freedom Edge actually involves

The three-day exercise is designed to enhance interoperability, which is military speak for making sure three different nations’ armed forces can actually work together seamlessly when it counts. Previous iterations of the Freedom Edge drill have featured Aegis-equipped destroyers from all three navies alongside strategic bombardment runs by US B-52H and B-1B bombers.

Freedom Edge traces its origins to the Camp David summit in August 2023, where the leaders of South Korea, Japan, and the US agreed to deepen their trilateral military relationship. The first exercises under the Freedom Edge banner kicked off in 2024, and the drills have expanded in scope and ambition with each iteration.

The backdrop: missiles, scaled-back drills, and diplomatic chess

The timing of Freedom Edge 2026 is particularly loaded. It arrives on the heels of a turbulent August that saw the annual Ulchi Freedom Shield exercise, the large-scale US-South Korea drill, conclude five days earlier than originally planned. That curtailment came at the direction of US President Trump, who has pursued diplomatic engagement with North Korean leader Kim Jong Un and apparently viewed scaling back exercises as a goodwill gesture.

North Korea’s response to the olive branch was, characteristically, a barrage of missiles. The approximately 10 short-range ballistic missiles launched around August 20 were widely interpreted as Pyongyang’s way of testing boundaries while the diplomatic channel remained nominally open. All three allied governments condemned the launches.

Why trilateral cooperation keeps deepening

Aegis-equipped destroyers, the backbone of the allied missile defense architecture in the region, rely on shared sensor data to track and potentially intercept incoming threats. A missile launched from North Korea toward Japan might be detected first by South Korean radar systems, tracked by US satellites, and intercepted by a Japanese destroyer. That chain only works if the three countries have practiced handing off targeting data under realistic conditions, which is precisely what Freedom Edge is designed to rehearse.

The inclusion of US strategic bombers in past exercises adds a deterrence layer that goes beyond missile defense. B-52H and B-1B bombers are nuclear-capable platforms, and flying them in a trilateral drill sends a message about extended deterrence, the US commitment to use its nuclear umbrella to protect its allies.

For South Korea and Japan, that commitment isn’t purely theoretical. Both countries sit within easy range of North Korea’s existing missile arsenal. Neither possesses nuclear weapons of its own, making the US extended deterrence guarantee the cornerstone of their national security strategies.

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