Pentagon official Elbridge Colby urges Asian allies to spend more on defense as Washington strengthens deterrence across the Indo-Pacific.
U.S. Undersecretary of Defense for Policy Elbridge Colby has urged Asian allies to invest more heavily in their own militaries, arguing that the future of Indo-Pacific deterrence will depend on a network of capable regional partners rather than American power alone. His message, delivered in Manila, comes as Washington manages simultaneous military pressures in the Middle East while trying to strengthen its position against potential aggression in the Western Pacific.
Washington's Message to Asia Is Becoming Clearer
Colby's remarks represent more than a routine request for higher defense budgets. They are part of a broader transformation in how the Trump administration views U.S. alliances.
Speaking in Manila, Colby said the United States is not disengaging from Asia. Instead, Washington wants to build a stronger regional defense architecture in which American forces work alongside allies that have greater military capabilities, more resilient defense industries and a greater ability to defend their own territory.
The central concept is what Washington calls "deterrence by denial." Rather than relying primarily on the ability to punish an adversary after an attack, the objective is to make aggression unlikely to succeed in the first place.
That requires forces positioned along strategically important areas of the Western Pacific, combined with allied capabilities that can complicate an adversary's military planning.
Colby has described the desired relationship as one involving "partners, not protectorates." His argument is that asking allies to invest more should not be interpreted as the United States abandoning them. Instead, Washington wants allied militaries to become sufficiently capable that a potential aggressor faces a coordinated regional defense rather than an American-led force operating largely on its own.
The approach is directly reflected in the 2026 U.S. National Defense Strategy, which calls for strengthening deterrence along the First Island Chain while encouraging regional allies and partners to contribute more to collective defense.
The First Island Chain Is Central to the Strategy
The geographic focus of the strategy is significant.
The First Island Chain stretches through a series of strategically important territories and maritime approaches running from Japan and Taiwan through the Philippines and toward Southeast Asia.
For U.S. planners, the region represents a critical defensive perimeter in the Western Pacific.
The 2026 National Defense Strategy calls for a stronger denial defense along this chain and says Washington will work with allies and partners to increase their contributions to collective defense.
The logic is straightforward.
If the United States has to provide almost all of the combat power required to defend every point along this enormous strategic arc, American forces can become overstretched. If regional allies instead possess capable air forces, missile defenses, naval forces, intelligence networks, logistics infrastructure and long-range strike capabilities, they can contribute to a much broader defensive system.
That does not mean every ally needs to build a military comparable to the United States.
Rather, Washington appears to be pushing partners to develop capabilities that are particularly useful for regional deterrence.
These can include:
- Integrated air and missile defense
- Maritime surveillance
- Anti-ship missile systems
- Long-range precision weapons
- Fighter aircraft and unmanned systems
- Coastal defense
- Cyber and electronic warfare
- Intelligence, surveillance and reconnaissance
- Hardened military infrastructure
- Ammunition and logistics capacity
The objective is to create a network in which an adversary cannot easily isolate one country and achieve a quick military advantage.
Why the Philippines Is Particularly Important
The Philippines occupies an unusually important position in this strategy.
Its geography places it close to Taiwan, the South China Sea and several major maritime routes. The country also has a long-standing defense treaty with Washington and hosts extensive military cooperation with U.S. forces.
Colby specifically praised the Philippines for strengthening its defense capabilities and pointed to its regular large-scale exercises with American forces.
That cooperation has become increasingly important as tensions in the South China Sea continue to shape Philippine defense planning.
Washington has repeatedly reaffirmed its treaty commitment to the Philippines, including in the context of armed attacks involving Philippine forces and assets in the South China Sea. Colby again reaffirmed that commitment during his Manila visit.
For Manila, however, the challenge is not simply increasing military spending.
The Philippines has to decide what capabilities provide the greatest deterrent effect for the money available.
A modern defense strategy could prioritize coastal missile batteries, maritime domain awareness, fighter aircraft, drones, naval vessels, air defense and resilient command-and-control systems rather than attempting to build a large conventional force across every military domain.
That makes the Philippine military modernization program strategically important well beyond Southeast Asia.
Indonesia and Thailand Are Also Part of the Equation
Colby's message was not limited to the Philippines.
He cited Indonesia and Thailand as examples of regional partners whose military capabilities and cooperation with Washington are becoming increasingly important.
Indonesia occupies a particularly important geographic position because of its location between the Indian and Pacific oceans. Its territory encompasses major maritime approaches and sea lanes connecting the two strategic theaters.
Thailand, meanwhile, has a longstanding defense relationship with the United States and remains one of Washington's established military partners in Southeast Asia.
Colby's Southeast Asian tour also includes Indonesia, Thailand and Cambodia, underlining Washington's attempt to broaden its network beyond the traditional U.S. alliances with Japan, South Korea and Australia.
This matters because the Indo-Pacific cannot be secured through a small number of formal alliances alone.
The United States increasingly needs access, interoperability and cooperation across a much wider geographical area.
Japan, South Korea and Australia Face a Different Calculation
The burden-sharing discussion looks different for America's major treaty allies.
Japan, South Korea and Australia already possess sophisticated militaries and substantial defense industries. Their challenge is less about creating basic military capacity and more about determining how much additional capability they should develop and how closely those capabilities should integrate with U.S. forces.
South Korea provides an important example.
During a visit to Seoul earlier in 2026, Colby described South Korea's decision to take greater responsibility for its own defense as evidence of what he called a realistic understanding of the changing security environment.
He argued that greater burden-sharing would help make deterrence more credible and sustainable.
Japan's role is similarly important because of its geography, advanced industrial base and increasingly sophisticated military capabilities.
Australia, meanwhile, is a critical southern anchor for the U.S. regional strategy, with deepening cooperation in areas including submarines, long-range strike and defense technology.
The emerging model is therefore not simply "spend more."
It is increasingly "build the capabilities that allow the alliance to fight together."
A Strategy Shaped by China's Military Rise
Although Colby avoided making China the central rhetorical target of his Manila speech, the strategic context is difficult to miss.
China has spent years expanding its naval, missile, air and space capabilities while developing increasingly sophisticated systems designed to complicate U.S. military operations in the Western Pacific.
For Washington, the concern is that a future crisis could develop faster than American forces can respond.
This is particularly relevant to scenarios involving Taiwan or contested areas of the South China Sea.
A large-scale Chinese military operation would not necessarily begin with a conventional invasion. It could involve missile strikes, cyber operations, electronic warfare, blockade or quarantine measures, maritime coercion and attacks against military infrastructure.
A distributed allied defense network could make each of those options more difficult.
The U.S. Congressional Research Service notes that the 2026 National Defense Strategy directs the Pentagon to maintain a favorable balance of military power in the Indo-Pacific, establish a strong denial defense along the First Island Chain and encourage regional allies and partners to do more for collective defense.
The Iran War Adds Urgency to the Message
The timing of Colby's remarks is also important.
The United States is currently dealing with a major military commitment in the Middle East involving Iran. That conflict demonstrates a basic problem facing any global military power: resources are finite.
Aircraft, ships, missiles, air-defense interceptors, intelligence assets, logistics capacity and trained personnel cannot simply be duplicated for every theater.
A prolonged Middle Eastern conflict could therefore increase pressure on Washington to ensure that its Asian allies are capable of handling more of their own immediate security requirements.
Colby sought to reassure Asian partners that the United States remains committed to the region despite its current focus on the Middle East.
His argument is effectively that the U.S. presence in Asia should become more sustainable precisely because allies are doing more.
That distinction is important.
Washington is not describing its policy as withdrawal. It is describing it as burden-sharing combined with strategic prioritization.
Allies Could Hear a Different Message
There is, however, a strategic risk.
When Washington repeatedly asks allies to spend more while simultaneously emphasizing limits on American resources, partner governments may interpret the message in two very different ways.
One interpretation is that the United States is building a stronger and more sustainable alliance system.
The other is that Washington is gradually shifting responsibility for regional security onto countries that may not have the economic or political capacity to match American expectations.
That distinction could affect alliance confidence.
The issue is particularly sensitive in Asia because several countries maintain complicated relationships with China. Many Southeast Asian governments want stronger security relationships with Washington without becoming formally aligned against Beijing.
That means the United States must balance two objectives:
- Increase allied military capability.
- Avoid forcing regional states into an explicit U.S.-China confrontation.
Colby's decision to emphasize regional balance and deterrence rather than directly attacking China in his Manila speech reflects that diplomatic reality.
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