Is the Iran War Pushing Southeast Asia Into China’s Arms?

Why It Matters

The episode reveals the limits of the U.S. security umbrella in shielding allies from economic fallout, reshaping great‑power competition and forcing Southeast Asian states to diversify their strategic options.

Key Takeaways

• Philippines declared energy emergency, seeking 1 million barrels fuel buffer.
• Vietnam deepened ties with China while maintaining strategic autonomy.
• Indonesia may need $5.9 billion subsidies, signs U.S. defense partnership.
• 52% of Southeast Asian respondents favor China over U.S. in crisis.

Pulse Analysis

The war in Iran has turned the Strait of Hormuz into a volatile chokepoint, disrupting crude, naphtha, LPG and refined products that flow into Southeast Asia’s petrochemical and agricultural supply chains. The International Monetary Fund warned that the region’s heavy reliance on Middle Eastern fuel makes it more vulnerable than other areas, and the shock is reverberating through the Strait of Malacca, a critical artery for 22 percent of global trade. This dual‑chokepoint pressure forces policymakers to confront not just scarcity but the precedent of using maritime passages as leverage.

In Manila, President Ferdinand Marcos Jr. activated a $333 million emergency fund and appealed to ASEAN for fuel‑sharing mechanisms after the country’s reserves fell to just 45 days. Vietnam, meanwhile, used the crisis to justify a deeper, yet carefully calibrated, partnership with Beijing, signing 32 agreements during To Lam’s April visit that include loans and infrastructure projects while preserving its non‑aligned stance. Indonesia, the region’s largest economy, anticipates up to $5.9 billion in extra energy subsidies and has just announced a U.S.–Indonesia Major Defense Cooperation Partnership, expanding maritime and autonomous‑systems collaboration without committing to a formal alliance.

These dynamics signal a shift in how Southeast Asian states balance security and economic imperatives. The United States’ expectation that allies shoulder more risk, as voiced by Defense Secretary Pete Hegseth, clashes with the reality that economic shocks originating from U.S. actions offer no cushion. Consequently, countries are hedging—maintaining cooperation with Washington while reducing exposure to its crisis management—thereby preserving strategic autonomy. For policymakers in Washington and Beijing, the lesson is clear: resilience will increasingly depend on flexible, multilateral supply chains and diplomatic engagement that respects the region’s need for maneuvering space.