Oil prices surged above $100 after President Donald Trump ordered a naval blockade of the Strait of Hormuz. The blockade, set to begin at 10 a.m. ET Monday, targets vessels entering or leaving Iranian ports and coastal waters. The announcement disrupted tanker traffic through the chokepoint and forced Europe and parts of Asia to pay premiums, ration fuel or reroute cargoes.

Blockade order and immediate market shock

The Pentagon and U.S. Central Command said the blockade targets vessels entering or leaving Iranian ports and coastal waters in the Arabian Gulf and Gulf of Oman. Within hours, maritime tracking showed tankers turning back and transit volumes through the Strait of Hormuz dropping sharply.

Oil traders reacted quickly. May U.S. West Texas Intermediate futures jumped more than 8% to about $104.40 a barrel, while Brent rose over 7% to roughly $101.86, pricing in the prospect of a deeper supply squeeze.

Shipping insurers and charterers scrambled for alternative routes and additional protection, and bids for tankers and LNG carriers climbed as buyers raced to secure cargoes already at sea. Prices for fertilizer feedstocks and helium — materials tied to Middle Eastern supply — also moved up, threatening cost pressures for agriculture and high-tech sectors.

How much oil moves through Hormuz, and who pays

Under normal conditions about one-fifth of global oil and a large share of seaborne liquefied natural gas pass through the Strait of Hormuz. Of that volume, more than 80% traditionally heads to Asian markets — China, India, Japan and South Korea — while European countries import a smaller but still critical slice.

Mastheads
  • European buyers have faced higher delivered costs as freight and supply premiums rise and rival purchasers bid for ships and cargoes.
  • Some Southeast Asian markets that rely heavily on Middle Eastern imports have earlier imposed rationing measures and are now facing renewed strain on kerosene and feedstock supplies.
  • Local supply hiccups at ports and airports — for example in Italy — illustrate how secondary markets feel the effects when a major shipping lane is constricted.

Economic fallout: inflation and growth

Higher energy prices add to inflation already rising in many economies. International financial institutions signaled they would likely lower global growth forecasts and lift inflation projections as the oil shock feeds through to food, transport and industrial costs.

Ben Emons, managing director at Fed Watch Advisors, warned that rising commodity costs for fertilizer and helium could push broader prices higher and deepen the economic toll on emerging markets that are less able to absorb price spikes.

For the United States the picture is mixed. The domestic shale boom has increased U.S. supply flexibility, but American consumers and businesses still feel higher global prices through imported refined products and elevated energy bills. Policymakers in Washington face a trade-off: using force to secure maritime routes could raise domestic inflation ahead of elections.

Geopolitical consequences and shipping strategies

The blockade escalates an already volatile standoff, increasing geopolitical risk around a critical maritime chokepoint. Markets and shippers are assessing how long the squeeze will last and which routes and insurance arrangements will be viable.

Shipping interests have signaled higher bids for tankers and LNG carriers and increased demand for insurance and protection measures. That re-pricing is already affecting delivered costs to Europe and parts of Asia and is shaping short-term decisions on cargo allocations and routing.

What policymakers and markets are weighing

  • Duration of the blockade and prospects for military escalation or diplomatic resolution.
  • Immediate effects on inflation and growth forecasts, especially in import-dependent economies.
  • Near-term supply management by major producers and logistical adjustments by buyers to limit shortages and price spikes.

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May U.S. WTI futures jumped more than 8% to about $104.40 a barrel.

This article was created with AI assistance.