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When Philippine President Ferdinand Marcos Jr. declared<\/a> a national energy emergency in late March, he exposed a problem Washington prefers not to see: The U.S. security umbrella does not automatically protect Southeast Asia from the economic fallout of conflict escalation in the Persian Gulf. A country thousands of miles from the Strait of Hormuz was suddenly scrambling to secure fuel, calm domestic pressures, and protect its economy from a conflict it did not start and could not influence. Philippine officials said at the time that the country had about 45 days of fuel reserves and was seeking an additional 1 million barrels to build buffer stock. That is now the condition of much of Southeast Asia.<\/p>\n The Iran war is often described as an energy shock, and of course it is. But the real question is, which states still retain enough agency under exposure to absorb the shock, rebalance their dependencies, and avoid being pushed deeper into one great-power orbit or the other? The disruption extends beyond crude. Naphtha, liquefied petroleum gas, and refined products moving through Hormuz feed directly into Southeast Asia\u2019s petrochemical and agricultural supply chains, narrowing the policy tools available to governments trying to adjust to the new reality. The International Monetary Fund (IMF) has warned<\/a> that Asia is more vulnerable than other regions to a prolonged war-induced energy shock because of its heavy dependence on Middle Eastern fuel. Exposure is widespread. Agency is not.<\/p>\n<\/p><\/div>\n When Philippine President Ferdinand Marcos Jr. declared<\/a> a national energy emergency in late March, he exposed a problem Washington prefers not to see: The U.S. security umbrella does not automatically protect Southeast Asia from the economic fallout of conflict escalation in the Persian Gulf. A country thousands of miles from the Strait of Hormuz was suddenly scrambling to secure fuel, calm domestic pressures, and protect its economy from a conflict it did not start and could not influence. Philippine officials said at the time that the country had about 45 days of fuel reserves and was seeking an additional 1 million barrels to build buffer stock. That is now the condition of much of Southeast Asia.<\/p>\n The Iran war is often described as an energy shock, and of course it is. But the real question is, which states still retain enough agency under exposure to absorb the shock, rebalance their dependencies, and avoid being pushed deeper into one great-power orbit or the other? The disruption extends beyond crude. Naphtha, liquefied petroleum gas, and refined products moving through Hormuz feed directly into Southeast Asia\u2019s petrochemical and agricultural supply chains, narrowing the policy tools available to governments trying to adjust to the new reality. The International Monetary Fund (IMF) has warned<\/a> that Asia is more vulnerable than other regions to a prolonged war-induced energy shock because of its heavy dependence on Middle Eastern fuel. Exposure is widespread. Agency is not.<\/p>\n That is why Southeast Asia matters as more than a regional economic story. It is one of the world\u2019s clearest theaters of constrained agency: a region of treaty allies, manufacturing hubs, maritime front lines, energy importers, and trade-dependent states with very different levels of resilience. Security leans toward Washington. Economic gravity leans toward Beijing. The 2026\u00a0State of Southeast Asia\u00a0survey<\/a> by the ISEAS Yusof Ishak Institute in Singapore captured that discomfort neatly: If forced to choose, 52 percent of respondents said they would side with China over the United States. That is not a vote for Chinese primacy. It is evidence of a region still trying to preserve policy space between two powers it cannot avoid.<\/p>\n The deeper danger is not only scarcity. It is precedent. If coercive bargaining over Hormuz becomes normalized, the logic does not stay in the Gulf. It travels east\u2014to the Strait of Malacca, accounting for nearly 22 percent of global trade; to the Sunda and Lombok alternatives; and to the wider maritime architecture on which Asian prosperity depends. In 2025, more than 102,500 ships transited Malacca, carrying 29 percent of maritime oil in just the first half of the year. Singapore\u2019s insistence that passage through Hormuz is a nonnegotiable right<\/a> is therefore not legal formalism. It is strategic preemption. What is being tested is not just supply resilience but whether chokepoints themselves become accepted instruments of leverage in an age of weakening restraint.<\/p>\n The Philippines sits at one of the narrowest points on this spectrum. Highly exposed to the social and economic fallout of the Hormuz shock, closely tied to Washington in security terms, and under constant maritime pressure from China, Manila must manage rising domestic costs from a distant war even as its strategic options remain compressed by geography, alliance commitments, and the realities of the South China Sea. The irony runs deeper than it first appears. Closer integration into U.S. military planning for the Indo-Pacific\u2014the expanded access arrangements and operational cooperation that make the Philippines strategically central to U.S. strategy\u2014does not insulate Manila from the economic shocks that strategy cannot cushion. It may actually narrow the hedging options that might otherwise soften them. The United States may help the Philippines defend reefs, but reefs do not power factories, move jeepneys, or stabilize food prices. Shortly after his March announcement, Marcos activated a $333 million emergency fund to strengthen fuel security and urged<\/a> fellow members of the Association of Southeast Asian Nations (ASEAN) to test the group\u2019s dormant fuel-sharing arrangements. Narrow agency can still produce improvisation\u2014but it remains narrow.<\/p>\n Vietnam represents a different, and in some ways more revealing, form of constrained agency. Less tightly bound to Washington than the Philippines and less visibly compressed by alliance politics, Hanoi still confronts the shock as an export-manufacturing state acutely sensitive to disruptions in fuel, logistics, and industrial inputs. What makes Vietnam analytically important is the way hedging can harden into selective embrace without becoming submission. During To Lam\u2019s April visit to China<\/a>, Beijing offered loans, technology, and connectivity investment. The two sides signed 32 agreements and elevated the language of strategic ties. This does not amount to abandoning autonomy. It suggests something subtler. In a world of erratic U.S. signals, Hanoi is thickening selected ties with China as insurance while still preventing either Beijing or Washington from foreclosing its options. What makes Vietnam strategically useful to Washington is also what limits Washington\u2019s leverage: Hanoi\u2019s refusal of formal alignment. Vietnam\u2019s agency lies not in escaping the China question, which it cannot do, but in calibrating proximity without surrendering strategic discretion.<\/p>\n Indonesia enters the same crisis with more scale, more diplomatic ballast, and a somewhat wider margin of adjustment. Jakarta may need up to $5.9 billion<\/a> in additional energy subsidies this year because of the war, yet its significance lies in something more than vulnerability. It is one of the few states in the region with enough size, fiscal capacity, and strategic habit to turn exposure into policy rather than simply into pain. The new U.S.-Indonesia Major Defense Cooperation Partnership announced<\/a> in April\u2014covering maritime, subsurface, and autonomous systems domains\u2014thickens the habits and logistics that would matter if access through Southeast Asia\u2019s maritime chokepoints ever came under pressure. But Indonesia is not becoming Washington\u2019s protectorate or mutual defense treaty ally. It is expanding its strategic options without allowing those options to harden into formal alignment.<\/p>\n Taken together, these cases reveal that the relevant divide in Southeast Asia is not between exposed and secure states\u2014there are almost none of the latter\u2014or between states leaning toward Washington and states leaning toward Beijing. The more important distinction is between states whose agency remains politically meaningful and states whose agency is being squeezed from both sides simultaneously. The Philippines shows compressed agency under alliance dependence and Chinese pressure. Vietnam shows calibrated proximity, preserving autonomy through selective deepening of ties. Indonesia shows how scale and ballast can widen the usable policy range without eliminating vulnerability.<\/p>\n