To understand why the Strait of Hormuz has suddenly returned to weigh on markets, two levels must be considered together.
On one hand, there are the increasingly hardline public statements between Washington and Tehran. On the other, diplomatic contacts continue — often indirect — through the countries that have spent months trying to keep a channel open between the two sides.
Public statements and diplomatic contacts are therefore not proceeding on separate tracks. Both serve Washington and Tehran as tools to reach any eventual negotiation from a more advantageous position. The risk is that a military action, an attack on a vessel, or a miscalculation could rapidly transform this show of force into something far more difficult to contain.
ContextHow We Got Here
The Strait of Hormuz is one of the most critical chokepoints in the entire global energy system. It connects the Persian Gulf to the Arabian Sea and is transited every day by a significant share of oil and gas exports from Saudi Arabia, Iran, Iraq, Kuwait, the United Arab Emirates and Qatar.
Its importance stems not only from the volumes transported. The key point is that for many producing countries, no sufficiently large alternative routes exist to rapidly divert exports to other corridors.
Whenever tensions with Iran escalate, Hormuz therefore becomes the principal instrument of leverage in Tehran's hands. Formally closing the Strait is not strictly necessary: threatening shipping traffic, raising risk levels for shipowners, or inflating insurance premiums may be sufficient.
In recent months, tensions between Iran, the United States and Israel had already resulted in a reduction in commercial shipping, an increase in the geopolitical premium on crude oil, and greater caution among companies operating in the region.
Subsequent efforts to reach a ceasefire had partially eased those tensions. The return of vessels to the Gulf and the resumption of diplomatic contacts had suggested that the most dangerous phase had been overcome.
Latest DevelopmentsWhat Happened This Week
Over the past few days, the situation has deteriorated once again.
Donald Trump declared the ceasefire phase over and issued fresh threats against Iran, while nonetheless leaving open the possibility of continuing negotiations. Tehran responded by disputing the American account and reiterating its unwillingness to relinquish its role in managing security in the Strait.
In parallel, diplomatic contacts have continued.
Qatar has persisted in its mediation efforts despite the direct involvement of its own energy interests. Oman, long one of the most reliable interlocutors in relations between the United States and Iran, has worked to prevent an outright breakdown.
It is precisely the role of these intermediaries that reveals how the game remains open. Public positions remain far apart, yet neither side appears willing to shut down dialogue entirely.
The central point of contention concerns the conditions of navigation through Hormuz.
Washington demands that the passage remain free, safe and free of any form of Iranian unilateral toll or oversight.
Tehran asserts instead a direct role in the security of the Strait, arguing that it cannot be excluded from the governance of a route that runs in part through its own territorial waters.
What is at stake, therefore, is not merely whether a maritime corridor should be reopened. It is a question of who should control it and on what terms.
The Strategic CruxWhy Hormuz Matters So Much
The issue is not solely the extreme contingency of a total closure.
Even a formally open Strait can operate well below its normal capacity. If shipowners perceive elevated risk, vessels may slow down, reroute or remain at anchor. Insurance companies may raise premiums, while freight costs inevitably end up rising.
The result is an increase in the effective price of energy even without a genuine supply disruption.
This is why markets watch not only political statements, but also actual tanker traffic, insurance costs, transit times and the decisions of major shipping companies.
These are the indicators that reveal whether tensions remain confined to rhetoric or are beginning to have a concrete impact on supply.
Asset allocationMarket reaction
The first asset to react was, naturally, oil.
Following Trump's new threats, Brent surged 5.2% in a single session to $78.02, while WTI reached $73.52. Prices subsequently corrected partially as talks continued, nonetheless closing the week with gains of approximately 5.4% and 4% respectively.
In the wake of the latest incidents, at least four tankers reversed course and traffic remained well below pre-war levels. This demonstrates that even an intermittent threat can reduce effectively available supply and support prices, without any formal closure of the Strait being necessary.
In equity markets, an escalation would initially favour energy producers and refining companies, while penalising airlines, transportation, industrials and consumer discretionary sectors.
Asian economies remain the most exposed to Gulf supply, whereas for Europe the risk materialises primarily through higher imported energy costs, a reduction in real incomes and potential disruptions to production supply chains.
The dollar could initially benefit from safe-haven demand. The response of Treasuries would be more complex: demand for safe-haven assets could support government bonds, while the risk of a renewed acceleration in inflation would exert opposing upward pressure on yields.
The reaction of gold is also less straightforward than one might expect. The precious metal can benefit from demand for protection, but an oil price increase capable of fuelling inflation expectations and rate hike fears may produce the opposite effect.
This is precisely what occurred on 8 July, when spot gold fell 0.9% as oil prices and bond yields rose. In that session, the market assigned greater weight to the risk of a more restrictive monetary policy than to traditional safe-haven demand.
Monetary policyThe central banks' dilemma
The Federal Reserve kept the Fed Funds rate in the 3.50%–3.75% range in June, while acknowledging that inflation remains elevated, partly due to energy shocks.
The minutes also reveal a divided Committee: some members already considered a rate increase appropriate, while others deemed it sufficient to maintain the current level.
A new and sustained surge in oil prices would further narrow the room for potential rate cuts and could bring the possibility of a fresh hike back to the fore. Much would depend on the duration of the shock: a temporary move could be absorbed, whereas a persistent increase would ultimately pass through from fuel into transportation, production and, finally, consumer prices.
The ECB's position is even more delicate.
In June, Frankfurt already raised rates by 25 basis points, bringing the deposit rate to 2.25% and explicitly citing the war in the Middle East and rising energy prices among the drivers of the decision.
The new projections put euro area inflation at 3% in 2026, against growth limited to 0.8%.
A further Hormuz disruption would therefore force the ECB to choose between combating imported inflation and protecting an already fragile economy.
Raising rates further would help contain the risk of the energy shock feeding through to other components of inflation, but would exacerbate the economic slowdown. Cutting them to support growth could instead weaken the euro and make energy imports even more expensive.
This is the classic dilemma generated by a stagflationary shock: higher prices and weaker growth simultaneously.
Scenario mapWhat to watch now
Technical agreement
Iranian guarantee on transit and an Oman-brokered agreement on route security. The geopolitical risk premium on oil would narrow.
Strait open, risk elevated
Sporadic attacks, threats and higher insurance costs. Volatile oil prices and a more prolonged restrictive monetary policy stance.
Physical disruption
Reduction in Gulf traffic and output, with knock-on effects on LNG, refined products, fertilisers, petrochemicals and shipping.
The most favourable scenario would be an Iranian declaration guaranteeing vessel transit, accompanied by a technical agreement with Oman on route security. In this case, the geopolitical risk premium on oil could narrow and rate expectations would gradually revert to being driven by economic data.
The intermediate scenario — perhaps the most insidious — is one in which the Strait remains formally open but is subject to sporadic attacks, threats and elevated insurance costs. Oil would remain volatile and central banks would be compelled to maintain a restrictive policy stance for longer.
The extreme risk remains a fresh physical disruption to traffic, accompanied by production cuts in the Gulf. This would not be merely an oil shock: it would encompass LNG, refined fuels, fertilisers, petrochemicals and shipping, passing the cost increase through to the entire global economy.
This is why the market is not merely monitoring Trump's statements or Tehran's responses. It is trying to determine whether tankers will continue to physically transit Hormuz.
Because, at this juncture, it is vessel movements — far more than words — that measure the true distance between war and agreement.