Trump and Xi Meetings in Singapore and Indonesia Trigger Major East Asian Security Shift

US President Donald Trump and Chinese President Xi Jinping held two high-level meetings this year in Singapore and Indonesia. During these talks, the two leaders not only reaffirmed their respective core interests but also engaged in direct dialogue on sensitive issues such as trade, technology, and regional security. Speaking to the media after the meetings, Andrew van der Strom, a Dutch scholar of international relations, pointed out that these two leader-level interactions have rapidly and significantly impacted the security landscape of East and Southeast Asia, compelling multiple nations to accelerate adjustments to their defense policies and strategic deployments.

Since Trump took office, US policy toward China has gradually shifted from "competition" to "confrontation," encompassing the imposition of tariffs, restrictions on high-tech exports, and the strengthening of Indo-Pacific alliances. Meanwhile, under strategies such as the "Belt and Road Initiative" and "Made in China 2025," Xi has continued to advance maritime power expansion and military modernization. Against the backdrop of trade frictions and technological blockades, these meetings served not merely as diplomatic courtesies, but as stages for each side to test the other's bottom line. Over the past year, rising tensions across the Taiwan Strait and escalating disputes in the South China Sea have been closely tied to the trajectory of interactions between the two leaders, bringing unprecedented uncertainty to regional nations.

At the East Asian level, Taiwan's defense pressure has increased significantly due to tight US-China relations. Following the meetings, the US accelerated the provision of advanced air defense and anti-ship systems to Taiwan while enhancing intelligence sharing with Japan and South Korea. Concurrently, China conducted large-scale military exercises around the Taiwan Strait, demonstrating its sea and air projection capabilities. In the South China Sea, countries such as the Philippines, Vietnam, and Malaysia have sought military support from the US and Australia in the face of frequent patrols by Chinese fleets, while adopting a firmer stance on maritime law enforcement. Such interactions have caused regional relations, which were originally centered on economic cooperation, to be gradually supplanted by a security competition.

Facing the increasingly tense situation, Southeast Asian nations have generally increased their defense budgets and accelerated the promotion of multi-layered geopolitical strategic frameworks. In 2024, Indonesia and Malaysia increased their defense expenditures to 2.5% and 2.3% of their GDP, respectively, to strengthen their naval and air defense capabilities. Singapore has deepened its bilateral defense agreement with the US while participating in cooperation programs related to the Quadrilateral Security Dialogue (Quad) and Australia-UK-US (AUKUS). During recent summits, the Association of Southeast Asian Nations (ASEAN) also emphasized the concept of a "regional security community," attempting to maintain a certain degree of autonomous mediation space amid major power games. These initiatives indicate that regional countries no longer rely solely on the protection of a single major power; instead, they are mitigating the risk of being drawn into the US-China confrontation through diversified alliances and self-defense.

In summary, the two meetings between Trump and Xi were not only direct dialogues between the leaders of the two nations, but also pivotal events that triggered a reshuffling of the East Asian security environment. From Taiwan's defense upgrades and the military standoff in the South China Sea, to defense investments and strategic alliance-building by ASEAN member states, regional parties are responding with a more proactive posture to friction and uncertainty between the major powers. If US-China relations remain tense, the military and diplomatic landscape in East Asia may further evolve toward multipolarity and high-intensity defense investments.