Southeast Asia is bracing for a shift in its security landscape. For decades, the region has benefited from a degree of stability underpinned by the United States’ security commitments. But with those guarantees increasingly in question, and the possibility of conflict in the Taiwan Strait looming larger, Southeast Asian nations are facing a critical juncture: how to defend their interests in a world where they can no longer automatically rely on American protection.
The growing uncertainty stems from a confluence of factors. Domestic political divisions in the U.S. Have eroded support for long-term, open-ended global commitments, while the potential for Washington to prioritize resources elsewhere – as seen in its responses to conflicts in Ukraine and the Middle East – is raising concerns about the reliability of its alliances. This perceived hesitancy is not going unnoticed in Beijing, which, according to the Department of Defense, views Southeast Asia as crucial to securing its southern flank in any potential Taiwan contingency.
The People’s Liberation Army (PLA) Southern Theatre Command has been specifically tasked with this role, as outlined in the DoD’s 2024 report on China’s military developments. Regardless of whether Southeast Asian countries choose to align with the U.S. Or China, or attempt to remain neutral, they will inevitably face difficult operational decisions – including whether to grant access to their airspace and waters – and navigate the complex political pressures of a major power conflict.
Beyond Evacuation: A Strategic Rethink is Needed
Still, current planning within the region appears to be falling short of addressing the full scope of the challenge. Recent simulation exercises conducted by the International Institute for Strategic Studies (IISS) suggest a tendency to focus primarily on the logistical aspects of a Taiwan contingency – specifically, the evacuation of citizens – while largely neglecting the longer-term strategic implications. This approach, the IISS report indicates, often relies on the assumption of external support from either the U.S. Or China, effectively treating the crisis as solvable once civilians are removed from harm’s way.
Here’s a critical miscalculation. A crisis in the Taiwan Strait is unlikely to be resolved with simply evacuating people. Southeast Asian states will then be confronted with far more complex decisions regarding access for external powers, the potential for basing arrangements, and the possibility of supporting military operations under intense pressure. These are not merely logistical concerns; they are fundamentally strategic choices that will determine the region’s position – and its fate – in a rapidly changing geopolitical landscape.
The Limits of External Guarantees
The erosion of U.S. Commitment isn’t the only factor at play. As Michael Beckley argues in *Foreign Affairs*, the domestic conditions that once sustained long-term American forward deployment are weakening. The U.S., while still possessing significant military capabilities, is increasingly reluctant to shoulder the burden of global security commitments without reciprocal contributions from its allies. This creates a precarious situation for Southeast Asia, leaving it vulnerable to both abandonment and coercion.
other potential security partners are unlikely to fill the void. Japan, facing its own security concerns, is expected to prioritize crises closer to home, particularly those related to Taiwan, according to reporting from the *Japan Times*. Similarly, India is focused on its ongoing disputes with China and Pakistan, and its strategic interests in the Indian Ocean, as highlighted by the Institute of South Asian Studies. These regional powers are unlikely to extend significant security guarantees to Southeast Asia, leaving the region largely to fend for itself.
Thinking Regionally, Acting Independently
The solution, experts argue, lies not in seeking new collective security arrangements – a new SEATO is politically unrealistic – but in a fundamental shift in how Southeast Asian nations approach defense. The challenge is to move beyond a purely national perspective and embrace a more regional understanding of security.
This doesn’t necessitate collective action or institutional coordination. Instead, it requires each state to independently assess its capabilities and, where politically feasible, share information about how those capabilities relate to the broader regional geography. This includes:
- Mapping key avenues of advance for external powers seeking to project force into the region.
- Identifying critical terrain, chokepoints, and vulnerabilities that could shape the operational possibilities of those powers.
- Concentrating efforts on positions each state can credibly defend without compromising its ability to protect its immediate interests.
Such an approach recognizes that stability isn’t solely about solidarity, but about calculated self-interest. Instability originating from great power competition can diminish the strategic depth available to countries further south, shrinking their buffer zones and exposing previously secure defensive lines. Rather than dispersing forces indiscriminately, states should focus on identifying key positions they can hold sustainably, while maintaining the mobility to maneuver as needed.
This regional perspective doesn’t eliminate the choice between alignment and neutrality in a Taiwan contingency. However, it alters the conditions under which those choices are made. By proactively managing the potential spillover effects of great power conflict – particularly demands related to access, basing, and overflight – states can prevent their foreign policy positions from being dictated by operational necessity. It allows them to delay, condition, or limit such demands, rather than being forced to comply under duress. Critically, this approach doesn’t require designating any single power as an adversary and remains applicable to future crises involving any external actor.
A Taiwan contingency will undoubtedly impact Southeast Asia, regardless of alignment. The crucial question is whether states can sustain their chosen positions under pressure. Without the capacity to manage those pressures, foreign policy risks becoming reactive rather than strategic.
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Looking ahead, the next key development to watch will be the upcoming Shangri-La Dialogue in Singapore in late May, where defense ministers from across the region and the world will gather to discuss pressing security challenges. The discussions there will likely offer further insight into how Southeast Asian nations are preparing for an increasingly uncertain future. Share your thoughts on these challenges in the comments below.
