Key Highlights

  • The US Dollar Index (DXY) rebounded above 99, rising about 1.4% after the US–Iran conflict escalation, reflecting strong safe-haven demand in currency markets.
  • Brent crude surged over 15%, climbing from around $70.75 to above $80 per barrel, raising concerns about renewed global inflation pressures.
  • Rising oil prices have pushed Federal Reserve rate-cut expectations from July toward September 2026, tightening financial conditions.
  • Energy-importing economies such as the eurozone and Japan faced currency pressure, highlighting asymmetric global energy exposure.
  • The Strait of Hormuz, which carries nearly 20% of global oil supply, remains the most critical geopolitical risk for global commodity markets.

 

A Conflict Markets Had Partially Priced In

When US and Israeli forces launched coordinated strikes on Iran on 28 February 2026, global financial markets did not freeze, they recalibrated. The measured rather than panicked initial response reflected a crucial dynamic: institutional investors had already anticipated the possibility of military escalation.

The extensive US military buildup in the region had been visible for months. As a result, the shock was largely confirmation rather than surprise.

That distinction matters for capital markets. The US Dollar Index rose roughly 1.4% in the days following the strikes, erasing its year-to-date losses and reaching a five-week high. The recent rebound in the US Dollar Index illustrates how currency markets rapidly repriced geopolitical risk following the escalation of the US–Iran conflict.

 

Safe-haven demand for the dollar intensified not purely because of fear, but because the economic transmission of the conflict structurally favours the United States.

The US, as a net energy exporter, is less exposed to the inflationary impact of higher oil prices compared with Europe and Asia. When crude prices rise, the economic burden is distributed unevenly and that asymmetry quickly appears in currency markets.

The Energy Channel: Why the Dollar Benefits

Energy markets are the most direct transmission mechanism of this geopolitical shock.

Brent crude surged from around $70.75 per barrel in late February to above $80 within days, a move exceeding 15%. At the same time, Qatar’s precautionary halt to some LNG production intensified supply concerns across global gas markets.

For major energy-importing economies, the implications are significant.

The eurozone and Japan remain structurally dependent on imported fossil fuels. Rising energy prices weaken their current account balances and increase inflation pressures, putting downward pressure on their currencies.

The euro declined roughly 0.85% against the dollar, while the Japanese yen weakened more than 0.7% in early trading following the escalation.

These moves reflect more than investor sentiment. They represent deteriorating terms of trade for energy-dependent economies.

The United States, by contrast, benefits from two reinforcing forces:

  • Safe-haven capital inflows
  • Relative insulation from oil-price shocks due to domestic energy production

This dual dynamic explains why many institutional strategists have cautioned against betting on a near-term reversal in dollar strength.

 

Federal Reserve Repricing and the Rate Outlook

The surge in oil prices has also complicated expectations for US monetary policy.

Before the conflict escalated, financial markets had largely priced in the first Federal Reserve rate cut by July 2026. Within days of the strikes, that expectation shifted toward September, although markets still anticipate two 25-basis-point cuts by year-end.

The reasoning is straightforward.

Higher energy prices feed into headline inflation with a lag, and sustained crude strength could limit the Federal Reserve’s ability to ease policy without risking renewed price pressures.

Compounding the issue, recent US manufacturing data showed rising input costs, signalling inflationary pressures independent of geopolitical developments.

Bond markets responded quickly. Ten-year US Treasury yields posted their largest daily increase since October, reversing earlier safe-haven inflows into government debt.

This created an unusual dilemma for investors. Equities faced geopolitical risk, while bonds faced inflation risk, leaving fewer traditional safe assets available.

The Strait of Hormuz: The Key Tail Risk

The most serious risk scenario has not yet materialised, but markets remain focused on it.

The Strait of Hormuz, a narrow maritime corridor connecting the Persian Gulf with global shipping lanes, carries roughly 20% of global oil supply.

Iran has threatened to close the passage.

If the strait were disrupted through direct blockade, mining operations, or tanker attacks the resulting supply shock would be far more severe than current price movements suggest.

Shipping markets are already reacting. Oil super tanker freight rates have reached record highs, reflecting surging insurance costs and heightened route risk premiums.

Asian economies, heavily dependent on Gulf energy supplies, would be particularly vulnerable to such disruptions.

The broader implications for global inflation, central-bank policy, and economic growth would be significant.

 

Petrodollar Dynamics and Strategic Currency Implications

Beyond immediate market movements lies a deeper structural dynamic.

Iran has increasingly supplied oil to China at discounted prices denominated in renminbi, challenging the traditional dollar-based energy settlement system.

US Treasury Secretary Scott Bessent had earlier acknowledged policy efforts designed to place economic pressure on Iran’s currency, the rial, suggesting that economic strategy preceded the military escalation.

If the conflict reduces Iran’s ability to export discounted oil outside the dollar system, it could indirectly reinforce demand for dollar-denominated energy trade.

For institutional investors monitoring long-term reserve-currency dynamics, this dimension adds an important structural layer to the current crisis.

Balancing the Risk Outlook

Several plausible scenarios could reshape market pricing in the coming months.

If military operations remain contained and the Strait of Hormuz stays open, oil prices could retreat, easing inflation concerns and allowing the Federal Reserve to resume its previously expected easing trajectory.

Under that scenario, the dollar’s safe-haven strength may fade, allowing earlier narratives around fiscal risk and trade tensions to regain prominence.

However, a prolonged conflict or disruption to Gulf shipping would sustain the opposite configuration: elevated oil prices, persistent dollar strength, tighter financial conditions, and constrained central-bank policy.

For now, the probability distribution remains wide.

What is clear is that the US-Iran confrontation has become a first-order variable in global capital markets, influencing currencies, commodities, equities, and fixed-income markets simultaneously.

In such an environment, the challenge for investors may not be predicting the conflict’s outcome, but managing exposure to the geopolitical risk now embedded in market pricing.

The US dollar strengthened as safe-haven demand surged following US-Iran tensions, while oil prices jumped above $80, reshaping Federal Reserve rate expectations and global capital market dynamics.

 

FAQs

  1. Why did the US dollar strengthen during the US–Iran conflict?

The US dollar strengthened primarily due to safe-haven demand and the United States’ relative energy independence. When geopolitical risks increase, global investors often move capital toward US assets, supporting the dollar.

 

  1. How did rising oil prices affect global markets?

Oil prices rose sharply following the escalation in Middle East tensions, with Brent crude climbing above $80 per barrel. Higher energy prices increase inflation risks and can delay central-bank interest rate cuts.

 

  1. Why are Europe and Japan more vulnerable to oil shocks?

Both the eurozone and Japan rely heavily on imported fossil fuels. Rising oil prices weaken their trade balances and increase inflation pressures, which can negatively affect their currencies and economic growth.

 

  1. Why is the Strait of Hormuz important for global energy markets?

The Strait of Hormuz carries roughly 20% of global oil supply, making it one of the world’s most critical energy chokepoints. Any disruption in the strait could significantly impact global oil prices and supply chains.

 

  1. How could the conflict influence Federal Reserve policy?

If higher oil prices persist, inflation pressures could increase. This may limit the Federal Reserve’s ability to cut interest rates, potentially delaying monetary easing and tightening global financial conditions.