The United States and Japan are using simultaneous military exercises to build a multilateral security architecture in the Indo-Pacific that extends toward Taiwan and the Philippines, with experts describing the emerging alignment as precisely the kind of regional deterrent that China’s leadership most wants to prevent from consolidating.
The US Marine Corps and Japan’s Self-Defense Forces launched a bilateral exercise at Camp Kengun in Kumamoto Prefecture on June 20, opening a 10-day drill that draws approximately 9,600 personnel from both militaries. The exercise, which runs through June 30, focuses on the defense of remote island chains in Japan’s southwestern archipelago, rehearsing scenarios that would be directly relevant to any Chinese military pressure campaign in the region.
A bilateral exercise with multilateral implications
The exercise is the latest iteration of an annual bilateral program, but this year’s edition carried several notable firsts. For the first time, Japanese military transport vessels participated in a bilateral drill of this kind, reflecting a more active posture from Japan’s Self-Defense Forces as the country continues to expand its defense capabilities and role in regional security. The incorporation of transport ships signals that Japan is developing the ability to sustain operations across the dispersed island chains that would be central to any conflict in the region.
The exercise spanned multiple bases from Kyushu to the outlying islands, reflecting the geographic scope of the security challenge Japan and the United States are jointly preparing to address. The southwestern island chain sits at the intersection of Japanese, Taiwanese, and Chinese maritime claims, making it among the most strategically sensitive terrain in the entire Indo-Pacific.
Valiant Shield adds multinational dimension
Running concurrently, US Pacific Command launched Valiant Shield, a biennial multinational exercise involving forces in Japan, Guam, the Commonwealth of the Northern Mariana Islands, and maritime areas around the Mariana Islands Range Complex. The exercise runs from June 22 to July 1 and incorporates forces from across the joint command alongside international partners.
The combination of Resolute Dragon’s bilateral island defense focus and Valiant Shield’s broader multinational scope creates an exercise environment that simultaneously rehearses specific tactical scenarios and builds interoperability across a wider coalition. That dual structure is increasingly deliberate, designed to demonstrate both the capability and the will to operate collectively across the region.
Building the network Beijing fears
Analysts studying the strategic architecture being constructed through these exercises describe it as a response to China’s incremental approach to expanding its military presence and political influence across the Indo-Pacific. Beijing has consistently identified American alliance networks in the region as a primary security concern, and the extension of US-Japan cooperation toward Taiwan and the Philippines represents exactly the kind of multilateral alignment that Chinese leadership has sought to prevent.
Taiwan sits at the center of China’s most sensitive territorial claims, while the Philippines hosts American military installations and has been the target of increasingly aggressive Chinese coast guard and maritime militia activity in the South China Sea. A security network that links American forces, Japanese capabilities, and partners in both locations creates overlapping deterrent commitments that are more difficult to challenge than bilateral arrangements alone.
Growing Chinese military pressure on Japan’s southwestern islands, including repeated air and naval incursions near disputed territories, has provided both the justification and the urgency for accelerating this multilateral framework. The exercises taking place now are not simply training events. They are demonstrations of intent directed as much at an external audience as at the forces participating in them.
