The weekend’s US-Iran military strikes have all but dismantled the interim agreement signed in June, sending Brent crude above **$78** per barrel on July 13 — its highest in three weeks. The US conducted dozens of strikes on Iranian air defences and drone sites, while Iran retaliated against US-linked targets in the Gulf and declared the Strait of Hormuz closed.
For central banks, the timing could not be worse. Goldman Sachs economists warn the price jump, meaningfully above pre-war levels, is already lifting inflation expectations just as the Federal Reserve’s new chair faces Congress and a key US inflation print lands on Tuesday.
The interim US-Iran deal lasted less than a month. Signed in June to reopen the Strait of Hormuz and halt four months of attacks on commercial shipping, it was supposed to buy a 60-day negotiating window. On Monday morning, **Brent crude futures** traded at $78.82 — **$8** above the level markets had settled at during the brief ceasefire. That gap is the cost of the deal’s collapse, and it lands squarely on the desk of the Federal Reserve’s new chair, Kevin Warsh, hours before he testifies to Congress for the first time.
The military escalation itself is familiar. US Central Command says it hit Iranian air-defence systems, coastal radar, and drone-launch capabilities across multiple locations. Iran’s Revolutionary Guards struck back at US-linked targets in Bahrain, Kuwait, and Oman. President Trump insists the strait is open. Iran claims it is closed. Ship-tracking data from Kpler showed six vessels crossed on Sunday — the lowest count in five weeks. But the number that matters more sits in fixed-income markets: the rise in longer-dated Treasury yields that signals bond investors are once again pricing a conflict-driven inflation premium into every asset class. Goldman Sachs wrote on Sunday that the move in crude is lifting inflation expectations and could alter the path of the federal funds rate.
The deal the market lost
Deutsche Bank’s Jim Reid called it a conflict that has “intensified sharply.” His note landed as US forces struck roughly **140 Iranian targets** overnight, bringing the total across three rounds to more than **300**, according to the US military. The stated goal: degrade Iran’s capacity to attack commercial vessels in the Strait of Hormuz, a chokepoint that normally carries **20% of global oil and LNG** shipments.
Iran’s response widened the geography of risk. The Revolutionary Guards reported missile and drone attacks on US-linked assets in Bahrain, Kuwait, Jordan, and Oman. Local authorities in Gulf states confirmed interceptions of some projectiles, dragging allies into a confrontation that had been confined largely to the strait itself. Ebrahim Zolfaghari, a spokesman for Iran’s military headquarters, claimed US interference has “seriously jeopardised” the security of global energy supplies while asserting Tehran’s authority over the waterway.
Patrick Bury, a security studies lecturer at the University of Bath, flagged an asymmetry that undermines any ceasefire’s durability. Cheap Iranian drones, he argued, allow Tehran to impose large costs on global oil traffic at relatively low expense. The economics of the deal were always thin: Washington sought a halt to attacks on shipping, but Iran’s drone fleet gave it a low-cost lever it could pull at any moment. The weekend’s strikes pulled it.
The oil supply recovery was already fragile. The International Energy Agency reported on Friday that global supply increased by 4.1 million barrels per day in June but remained **9.4 million bpd below pre-war levels**. Seven OPEC+ members agreed to raise quotas by **188,000 bpd** in August — an increment too small to outrun the risk premium now embedded in futures curves.
The equity market reaction was swift and uneven. Japan’s Nikkei lost **1.0%** and South Korea’s benchmark eased 0.4%, extending an **8% weekly loss** for tech-heavy Seoul. The MSCI index of Asia-Pacific shares outside Japan slipped 0.2%. S&P 500 futures pointed 0.3% lower and Nasdaq futures were off 0.5%. The dollar firmed to 101.12 on its index, while the euro slipped to $1.1403 and the dollar rose 0.1% against the yen to 161.96. It was a classic flight to safety — into the greenback, out of almost everything else.
The message in the bond market
Brent’s move tells one story. The Treasury market tells another. Ten-year yields rose **2 basis points** to 4.59%, and fed fund futures slipped 2 ticks, implying **34 basis points** of additional tightening by year-end. Rate-cut bets that had built in recent weeks are eroding. The June US consumer price index, due Tuesday, is expected to show headline inflation cooling to 4.2%. But an oil spike that persists through the third quarter would reverse that progress rapidly.
The timing for Kevin Warsh is brutal. His first congressional testimony as Fed chair lands on the same day as the CPI print. He must now address whether a supply-driven energy shock — one that monetary policy cannot easily counteract — forces the committee to look through the jump or respond to second-round effects showing up in core measures. Goldman Sachs economists flagged exactly that tension: oil meaningfully above its pre-war baseline is lifting inflation expectations, and the Fed’s path depends on how sticky those expectations become.
The ripple effects reach Tokyo. Japanese Finance Minister Satsuki Katayama floated the idea of encouraging the **$1.8 trillion** Government Pension Investment Fund to shift its 50/50 domestic-offshore allocation closer to the pre-pandemic 60/40 split. NAB’s Taylor Nugent noted that such a move would generate large yen-buying flows but warned allocation reviews are slow and the current fiscal-year plan is fixed. The yen barely moved, but the signal was clear: Asian officials are scanning their toolkits as energy-driven inflation threatens currencies already under pressure.
The escalation follows a pattern the past six weeks made visible. A previous wave of strikes in June split markets between commodities and equities, with AI stocks holding firm while oil and the dollar surged. That split now deepens. Citi analysts maintained their overweight stance on global IT and the US, citing strong earnings momentum and attractive valuations. Yet the same note paired that with overweight positions in cyclical markets — Japan, financials, materials. The portfolio logic is defensive: hold tech if you must, but load up on sectors that benefit from the very inflation scare that threatens tech’s valuations.
Beyond the headline
The Timing
The strikes landed as investors were positioning for a data-driven week centred on Warsh and the CPI. A single weekend of hostilities at a major chokepoint has repriced global risk instantly, turning a routine calendar into a test of whether central banks can hold their narratives together under an energy shock.
The Bigger Picture
The global energy system still hinges on a few geopolitically fragile shipping lanes. Military decisions in one corridor can override months of monetary signalling. Until diversification away from Hormuz advances, drone and missile math will keep winning arguments that central banks thought were settled.
The Reach
Western pension and asset managers must recheck inflation assumptions and regional allocations. If energy-driven price pressures endure, portfolios tilted toward long-duration growth assets face renewed valuation stress, potentially accelerating a rotation into cash-generating energy, financials, or Japan — shifts that feed back into funding conditions far beyond the oil patch.
What to watch as the energy shock hits portfolios
With the Strait of Hormuz still contested and the interim deal in tatters, the week ahead forces three distinct decisions for different readers.
- US-based investor with APAC emerging market exposure
Re-evaluate your allocation to energy-importing Asian economies now. The MSCI Asia-Pacific index outside Japan fell only modestly on Monday, but the yen and won weakness tells you capital is already moving. Check your exposure to Japanese and South Korean equities through the lens of oil costs, not just earnings momentum. A sustained Brent price above $78 will compress margins in a way that the current index levels have not yet discounted. Monitor the US Department of State’s maritime advisories for any escalation that triggers broader shipping insurance spikes.
- Western supply chain manager for energy-dependent industries
Six vessels crossed the strait on Sunday — normally the count is multiples higher. If traffic remains severely restricted this week, alternative crude and LNG sourcing becomes urgent. Consult the IEA’s latest supply data to model the drawdown rate from current inventory levels. Your logistics team needs pricing on longer-haul routes that bypass Hormuz entirely, because every day of reduced transits tightens spot availability.
- US Federal Reserve policy analyst
Warsh’s Tuesday testimony and the CPI print now carry a risk premium the data alone does not explain. Track two things before he speaks: the five-year breakeven inflation rate in TIPS markets and the daily vessel count through Hormuz from Kpler. If breakevens drift higher while transits stay below ten ships a day, prepare a policy brief that models a second-round inflation pass-through. The market is already pricing an additional 34 basis points of tightening — your analysis needs to show whether that is adequate or under-reacting.
Explainer
- Brent crude
- The global benchmark price for oil, based on crude extracted from the North Sea. It is the reference price for roughly two-thirds of the world’s internationally traded oil, including most cargoes from the Middle East headed to Asia. Its jump to $78.82 on July 13 reflects the immediate repricing of supply risk through the Strait of Hormuz.
- Strait of Hormuz
- A narrow waterway between Iran and Oman connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea. It is the world’s most important oil transit chokepoint, with about 20% of global petroleum and LNG shipments passing through it daily. Any closure forces tankers onto longer, costlier routes and instantly raises global energy transportation costs.
- GPIF
- Japan’s Government Pension Investment Fund, the world’s largest public pension fund with roughly $1.8 trillion in assets. Its allocation decisions between domestic and foreign assets can move currency markets, particularly the yen, because of the sheer scale of the flows involved. Finance Minister Satsuki Katayama’s suggestion to tilt back toward domestic holdings is being read as a potential tool to support the weakening yen amid rising energy-import costs.
- Fed fund futures
- Financial contracts traded on the Chicago Mercantile Exchange that let investors bet on or hedge against the future path of the Federal Reserve’s benchmark interest rate. The price of these futures implies the market’s collective forecast for rate moves. A 2-tick slip on July 13 signalled that traders now expect an additional 34 basis points of tightening by the end of 2026, up from previous estimates, directly reflecting oil-driven inflation fears.
RELATED STORIES
