Euro climbs as US-Iran truce sparks 4% oil rout

The euro strengthened sharply against the dollar Monday as a weekend pause in US-Iran hostilities triggered a broad risk-on rotation, sending crude oil down more than 4% and lifting equities across Europe and Asia.

"The de-escalation removes the most acute tail risk that was keeping investors anchored to safe-haven assets," said Elena Fischer, geopolitical risk analyst at Edgen. "The question now is whether this pause becomes a durable ceasefire or merely a tactical breather."

Brent crude futures for October delivery fell 4.23% to $87.80 a barrel, while West Texas Intermediate dropped 4.90% to $84.93, after the US halted its 13-day bombing campaign against Iranian targets over the weekend and Iran refrained from retaliatory strikes. The dollar index, which had climbed to a one-month high of 101.52 last week on safe-haven demand, eased back toward 101.30 as capital rotated out of the greenback. Gold, which had benefited from both避险 flows and inflation hedging, rose 1.3% to $4,103.99 an ounce, though silver outperformed with a 2.7% gain to $59.74.

The risk-on repricing carries implications beyond currency markets. The sharp decline in crude oil — which had surged more than 30% above pre-conflict levels during the bombing campaign — eases near-term inflation fears that had been building since the conflict began. That shift arrives just ahead of a pivotal week for central banks: the Federal Reserve delivers its rate decision Tuesday, followed by the Bank of England on Thursday and the Bank of Japan on Friday. Swap markets had been pricing a 36.3% probability of a 25-basis-point hike from the Fed as recently as last week, a bet that now looks less certain with oil retreating.

The Fed decision now carries added weight

The Federal Reserve's July 28-29 meeting was already the week's marquee event, but the geopolitical backdrop has shifted the stakes. Before the weekend truce, the 10-year US Treasury yield had touched a two-month high of 4.64% as traders priced in the possibility that sustained oil-driven inflation could force the Fed to keep rates elevated or even hike. The subsequent crude selloff has pulled those expectations back, though the central bank is still widely expected to hold the fed funds rate at 3.50%-3.75%.

"The oil price move gives the Fed breathing room," said James Okafor, macro strategist at Edgen. "If Brent had stayed above $100 into the meeting, the hawkish tail would have been hard to ignore. Now the focus shifts back to the core inflation trajectory and the labor market."

US economic data had been running hot ahead of the conflict: weekly jobless claims posted their largest drop in nearly 60 years, and July flash PMIs showed private-sector activity growing at the fastest pace this year. Those numbers had reinforced the case for a prolonged hold, but the oil-driven inflation scare had added a layer of complexity that now appears to have receded.

What comes next depends on diplomacy

The durability of the risk-on move hinges on whether the US-Iran pause holds. President Trump halted the bombing campaign to allow diplomatic efforts to proceed, and both sides have refrained from military action for two consecutive days. Houthi forces backed by Iran had previously claimed attacks on Saudi oil tankers, raising fears of a naval blockade in the Strait of Hormuz, which handles about 21% of global oil trade. Those threats have not been formally withdrawn.

For currency markets, the euro's gains reflect a broader recalibration of relative rate expectations. The European Central Bank held rates unchanged last week but signaled it could hike in September, a stance that now looks more credible with oil prices retreating. If the Fed delivers a dovish hold Tuesday — acknowledging the disinflationary impulse from lower energy costs — the dollar could face further pressure, extending the euro's rally.

The last time a similar geopolitical de-escalation triggered a comparable risk-on shift was in November 2023, when a temporary Israel-Hamas truce sent the dollar index down 1.8% over two weeks while the euro gained 2.1%. The current setup carries echoes of that episode, though the scale of the oil move — Brent had risen above $100 before this weekend's pause — makes the stakes considerably higher.

This article is for informational purposes only and does not constitute investment advice.