US-Iran MOU Lapses; Oil Surges, Equities Slip, and the Fed Path Gets Complicated Again

Markets opened the week with the Middle East back at the top of the agenda, after both Washington and Tehran signalled they had no interest in extending the June memorandum of understanding that had been containing their standoff. Iranian Foreign Ministry spokesperson Esmail Baghaei ruled out further negotiations, while President Trump told Fox News he had little interest in prolonging the arrangement — going as far as to demand Iran's surrender and threaten to bomb Oman, the US ally that had been mediating the Strait of Hormuz talks. A senior Iranian official responded that the country would shift to an offensive posture if diplomacy collapses.

The escalation matters not just for oil but for the broader Fed narrative that had begun to take hold. Softer US data through August had cooled expectations for further tightening; a renewed crude spike threatens to reintroduce inflation risk just as policymakers had been given room to breathe. With few major scheduled catalysts, geopolitics is likely to dominate this week, alongside Wednesday's FOMC minutes and major retail earnings.

Equities: Risk Off, But Not Yet Panicked

US indices slipped as oil's advance rattled sentiment. The S&P 500 and Dow each lost more than half a percent, while the Nasdaq held up marginally better. Some analysts still see room for a diplomatic reset — particularly given the approaching midterm elections, which create a strong incentive for the White House to avoid a full-blown energy shock heading into the campaign. That's a thin thread, but it helps explain why the initial selloff has been measured rather than disorderly.

Oil: The Real Story of the Week

WTI jumped 2.6% to $84.50 a barrel, with Brent climbing 2.7% to $90.87 as markets braced for further escalation. The move matters not just for its magnitude but for what it does to the broader macro picture. Softer US data over the past week had been quietly cooling expectations for further Fed tightening; a sustained oil rally could complicate the inflation outlook and put those expectations firmly back on the table.

Structural context matters too. US Strategic Petroleum Reserve inventories remain at multi-decade lows, meaning the physical buffer against a sustained supply shock is unusually thin. Combined with the collapse of the diplomatic channel, that leaves oil markets asymmetrically positioned toward further upside on any incremental escalation.

Gold: Testing Fresh Resistance

Gold advanced as a softer dollar and reduced odds of near-term Fed tightening lent support, before easing on Tuesday as the dollar firmed on safe-haven flows. The metal has met heavy resistance around the $4,435-$4,449 zone. Medium-term, the backdrop remains constructive — challenging inflation outlook, sustained central bank accumulation, rising geopolitical risk — but near-term action will be dictated by the interplay between dollar strength, real yields, and further Iran-related headlines.

Dollar: Squeezed Between Two Narratives

The Dollar Index fell to a two-month low last week as softer US employment, inflation, and retail sales data weighed on rate expectations. Renewed geopolitical risk has since revived safe-haven demand, helping the index rebound. This tug-of-war — dovish fundamentals pulling the dollar lower, geopolitical anxiety pulling it higher — is likely to define trading this week. Wednesday's FOMC minutes could tip the balance either way, depending on how much internal concern about oil-driven inflation gets airtime.

Euro & Yen

The euro pulled back after touching a two-month high, but the broader story is that the ECB is now widely expected to deliver one final 25bp hike in September. That policy divergence should limit euro downside even during dollar rebounds.

The yen weakened against the dollar despite continued hawkish signalling from the Bank of Japan. The latest Summary of Opinions showed several policymakers favouring further tightening, with one member calling for a faster pace of hikes. That hawkish tone has been partly offset by a weaker-than-expected preliminary Q2 GDP print, leaving the yen caught between domestic policy momentum and softer growth data.

Week Ahead

Wednesday's FOMC minutes are the marquee scheduled release. Beyond that, the calendar is thin — any Iran-related headline is likely to move markets disproportionately. Major retail earnings will offer a read on the US consumer, whose resilience has been one of the last remaining pillars of the growth story.

The Takeaway

A single expired MOU has reset the entire week's macro narrative. Oil is the swing factor: if crude sustains its advance, the Fed's newly emerging patience gets called into question, the dollar's downtrend loses conviction, and equities face a genuine headwind. If diplomacy finds an off-ramp, the risk rally resumes. Position for both.