Iran War’s Economic Shock Is Driving Southeast Asia Closer to China, Not the U.S.

The Iran war is not just a Middle East crisis — it’s a global economic earthquake shaking Southeast Asia’s fragile balance between Washington and Beijing. When Philippine President Ferdinand Marcos Jr. declared a national energy emergency in March, it revealed a painful truth: U.S. security guarantees do not shield allies from the fallout of conflicts they have no control over. Thousands of miles from the Strait of Hormuz, the Philippines scrambled for fuel reserves amid soaring prices and supply disruptions, a scenario now echoing across much of Southeast Asia.

This region, heavily dependent on Middle Eastern oil and petrochemical imports, faces a double bind. The International Monetary Fund warns that Asia is uniquely vulnerable to prolonged energy shocks due to this dependence. Yet the capacity of these nations to absorb the impact and pivot their policies is severely limited. Southeast Asia is caught between a U.S. security umbrella that cannot protect its economies and China’s growing economic gravity pulling them into its orbit.

The dilemma is stark. Countries like the Philippines and Vietnam are treaty allies or strategic partners of the U.S., hosting military bases and participating in joint operations aimed at countering China’s maritime ambitions. But these security ties do not translate into economic resilience. Manila’s expanded military cooperation with Washington has done nothing to ease fuel shortages or inflation triggered by the Iran conflict. Instead, it narrows Manila’s options to hedge against these shocks, forcing it to lean more on China economically.

The 2026 State of Southeast Asia survey by Singapore’s ISEAS Yusof Ishak Institute highlights the region’s uncomfortable reality: 52 percent of respondents would side with China over the U.S. if forced to choose. This is not a celebration of Chinese dominance but a pragmatic reflection of where economic lifelines currently flow. China’s Belt and Road projects, trade networks, and energy investments offer tangible support that U.S. military guarantees simply do not.

Moreover, the Iran war is setting dangerous precedents. If coercive tactics over critical chokepoints like the Strait of Hormuz become normalized, this logic could extend to Southeast Asia’s own maritime arteries such as the Strait of Malacca — a vital global trade route. Singapore’s firm stance that passage through Hormuz is a nonnegotiable right is a strategic effort to prevent such leverage from becoming routine, but the threat looms.

The Trump administration and its successors have prioritized military posturing over economic security for allies, leaving countries like the Philippines exposed to the fallout of foreign wars while deepening their dependency on China. The facade of U.S. regional dominance cracks further as economic realities force Southeast Asia to recalibrate its loyalties.

In short, the Iran conflict is accelerating a geopolitical shift that Washington can no longer ignore. Its failure to protect Southeast Asia’s economic interests while demanding strategic alignment is pushing the region squarely into China’s embrace. This is a stark lesson in the limits of military alliances when they are not backed by economic support and genuine partnership. The U.S. risks losing Southeast Asia not just to China’s guns but to its wallets.