Iran War Shows Dollar's Grip Starting To Slip On Asia

(MENAFN- Asia Times) For years, markets have treated geopolitical tension as a one-way trade: buy dollars, sell Asia.

The logic has been simple and, until now, largely reliable. Conflict pushes oil higher, capital rushes into US assets and Asian currencies weaken under the combined weight of rising import costs and capital outflows.

But March 2026 has started to disrupt that logic. The dollar did what it always does at first. As tensions around Iran escalated, the US Dollar Index pushed above 100 and oil surged, with Brent moving into the $116–$126 range.

Disruption to the Strait of Hormuz, a key route for global energy flows, reinforced the sense that this would be another textbook episode of prolonged dollar strength. However, what followed has been far more telling.

As expectations grew that President Donald Trump could halt further military escalation, the dollar began to soften, even though oil remains elevated and supply constraints have not fully eased.

In previous cycles, that combination would have kept the dollar firmly bid. This time, investors have been quicker to step back. The shift, although still tentative, carries significant implications for Asia.

The region’s currencies have long been tied to the greenback’s behavior during periods of stress. A stronger US dollar has tended to amplify existing vulnerabilities, from energy dependence to capital-flow sensitivity. A weaker or less dominant American currency changes the balance, and not evenly.

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Japan has been one of the clearest casualties of the old pattern. The yen’s slide toward 160 against the dollar has already pushed policymakers to the edge of intervention. Higher oil prices have, of course, compounded the problem, feeding directly into inflation in an economy that relies heavily on imported energy.

A dollar that fails to hold its gains alters that dynamic. The yen doesn’t need oil to fall sharply to stabilize. It needs the dollar to stop rising automatically. Even a partial retracement would ease pressure on households and give the Bank of Japan more control over its next steps, rather than reacting to external forces.

South Korea’s won reveals how quickly conditions can deteriorate when both currency and capital flows move in the same direction. The move beyond 1,500 per dollar has been driven not only by higher energy costs, but also by a sharp reversal in equity inflows. Foreign investors have exited aggressively, accelerating the decline.

Here, the dollar’s changing behavior matters more than anything else. A continued surge would deepen outflows and extend the currency’s weakness. A softer dollar removes that accelerant. Stability becomes possible without a dramatic improvement in sentiment, and once the selling pressure eases, recovery can begin.

India’s rupee is, though, in a more difficult position. Oil remains the dominant factor, widening the current account deficit and adding to inflation risks.

A less dominant dollar does not solve those challenges, though it does slow the pace at which they feed into the currency. The difference is not dramatic, but it is meaningful. Pressure becomes more manageable, and policy responses gain traction.

But the real divergence is emerging in Southeast Asia. Malaysia stands out as one of the few economies that benefits directly from higher oil prices. As a net exporter, it enters this period with a stronger external position, supported by steady growth and relatively contained inflation.

In a world where safe-haven demand is no longer concentrated in the dollar alone, the ringgit has a clearer path to stability, and potentially strength.

Thailand and the Philippines face a more uncomfortable reality. Rising fuel costs are feeding into domestic economies, placing strain on households and key industries. The impact is immediate and visible, and while a softer dollar offers some relief, it doesn’t offset the pressure created by sustained high energy prices.

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China, the world’s second largest economy after the US, remains a special case. The yuan is tightly managed, and policymakers retain the ability to guide its direction. Even so, a shift in dollar dynamics reduces the need for defensive positioning and allows greater focus on domestic priorities, particularly as export sectors continue to hold up.

Of course, none of this suggests the dollar is losing its central role overnight. The initial rally during the crisis shows that investors still turn to US assets in the early stages of uncertainty. What’s changing is the persistence of that demand.

What’s unfolding now is, it would appear, more conditional. Gains are fading sooner, even though the underlying risks remain in place. A dollar that no longer commands automatic and sustained demand during periods of stress creates space for differentiation.

Asian currencies are no longer moving as a single bloc, with outcomes becoming more closely tied to domestic fundamentals, external balances and policy credibility.

Markets have relied on a familiar pattern for decades. The month just gone suggests that pattern is starting to change. Asian currencies are not yet separated from the US dollar’s influence, not by a long way, but they are no longer moving entirely at its mercy.

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