Oil at $88 as US Blockade Goes 'Indefinite' While US-China Trade Truce Unravels

Three geopolitical risk vectors are converging into a single market signal this August, and the signal is this: the cost of moving energy, goods, and capital across borders keeps rising, and no one in a position to lower it has an incentive to do so soon.

Brent crude settled Friday at $88.52 a barrel, up 6% for the week^[1]. West Texas Intermediate closed at $82.40^[2]. Both benchmarks have climbed roughly 24% since the US-Israel military campaign against Iran began in late February^[3], and the trajectory has been stubbornly upward — not spike-and-fade, but a grinding repricing as each diplomatic round fails to deliver a breakthrough.

The driver is the Strait of Hormuz. Before the war, about 20 million barrels of oil and petroleum products transited the strait each day — roughly one-fifth of global supply^[3]. On Monday of this week, just 10 vessels crossed the waterway, compared with roughly 130 daily transits before the conflict^[3]. The seven-day average for oil exiting the strait has recovered to somewhere between 7 million and 9 million barrels per day, depending on whose tracking data you trust — tanker-tracking firms estimate the lower end, while US Energy Secretary Chris Wright cited the higher^[3]. Either way, the gap between pre-war throughput and current flow represents the largest energy disruption in recorded history.

The blockade is now policy, not tactic

What shifted this week is the clarity of US posture. Defence Secretary Pete Hegseth said Thursday that the navy could maintain its blockade of Iranian ports “indefinitely,” rotating ships in and out as needed^[2]. Treasury Secretary Scott Bessent followed with a promise of further financial measures: “We are going to apply measures like have never been seen in the history of economic isolation on a country,” with announcements expected next week^[2].

This is no longer a temporary enforcement action — it is being framed as a standing policy. That distinction matters for how markets price the risk premium. A temporary blockade creates an option value: the strait could reopen tomorrow, and prices would gap down. An indefinite blockade converts that option into a structural supply constraint, which means the risk premium stays embedded until something fundamental changes — either Iran capitulates, the US relents, or alternative supply paths scale up enough to matter.

The IEA has already absorbed this shift. It cut its 2026 global oil supply forecast to the lowest level of the year, projecting a 4.3 million barrel-per-day decline — 600,000 bpd deeper than its July estimate^[2]. The US EIA does not expect Middle East oil production to return to near pre-conflict levels until early 2027 and forecasts Brent averaging $87 a barrel for the full year^[3]. OPEC cut its 2026 global demand growth forecast to 580,000 bpd, its fourth consecutive downward revision^[2] — a sign that high prices are themselves destroying demand, which tempers the upside but does not reverse the supply-driven floor.

The diplomatic track is alive but barely. Qatar’s Foreign Ministry said Oman-mediated talks with Iran are at an “advanced stage”^[3], though Tehran has insisted the negotiations are separate from the strait’s reopening and will remain closed until the US agrees to conditions including war reparations and sanctions relief^[3]. As analyst Tim Waterer of KCM Trade put it: “Markets have not completely lost hope for a deal, but confidence is clearly eroding”^[3].

Put numbers on it: I would frame the probability of a Hormuz reopening before October at roughly 30%. The diplomatic channel exists, but the conditions Iran has set — reparations, sanctions lifting — are precisely the concessions the US has escalated its posture to avoid granting. The 70% base case is continued constriction through Q3, with Brent trading in an $85–92 range, supported by strategic reserve releases that are, as Saxo Bank’s Ole Hansen noted, “supply borrowed from the future” that will eventually need rebuilding^[2].

Saudi Arabia is already rerouting — and paying for it

The pressure is not abstract. Saudi Arabia is now shipping more oil through a pipeline across Egypt to the Mediterranean to avoid Houthi attacks on tankers in the Red Sea^[4]. But tankers taking the longer route around Africa to reach Asian customers face a cost penalty that compounds with every week the Bab al-Mandeb strait stays dangerous. On Tuesday, a Houthi missile attack on a commercial vessel in the Bab al-Mandeb killed six people^[3] — a reminder that the Hormuz crisis is layered on top of a Red Sea disruption that never resolved.

A second front: US-China trade escalation ahead of Xi’s visit

While oil dominates the risk dashboard, a parallel escalation between Washington and Beijing is tightening the screws on a different set of supply chains — and timing it awkwardly against a planned Xi Jinping visit to Washington in September.

On August 6, President Trump signed a proclamation imposing a 15% tariff on polysilicon, the base material for semiconductors and solar panels^[5]. China is the world’s largest producer of polysilicon, and the White House explicitly framed the move as a national-security supply-chain protection^[5]. US solar stocks jumped the following day^[5].

Beijing’s response was the broadest package of trade countermeasures since the October “Busan truce.” China’s Ministry of Commerce barred Chinese entities from doing business with seven American companies and organizations, tightened export controls on US-bound drones and related technology, and — for the first time — prohibited Chinese firms from cooperating with US compliance and certification bodies, including in mandatory factory inspections^[6]. Six of the sanctioned entities were targeted over Xinjiang-related sanctions; the seventh, Arizona-based Compliance Testing, was blacklisted for assisting FCC measures against Chinese products^[6].

Eurasia Group flagged this as a structural shift: Beijing is “starting to replicate” Washington’s playbook, not just absorbing sanctions but now constraining the flow of Chinese technology to the US, as BNP Paribas analyst William Bratton observed^[6]. China also launched its first-ever national security investigation in the foreign trade sector, targeting imported printing and copying equipment with foreign software — a mechanism Eurasia Group warned could be extended to other sectors with effects comparable to US curbs on Chinese software in connected vehicles^[6].

Then on August 14, the White House published a report titled “The Great Transshipment Scam,” accusing more than 40 countries — including Canada, India, Mexico, Japan, and South Korea — of helping China evade US tariffs by routing exports through lower-duty jurisdictions^[7]. The report, led by trade adviser Peter Navarro, estimated the US is losing $19–26 billion annually in tariff revenue to the practice^[7].

The irony is that the countries named in the report include the very allies the US needs for its trade and security architecture in Asia. Accusing Japan and South Korea of complicity in Chinese tariff evasion — while simultaneously asking them to support the Iran blockade and absorb the energy costs it generates — is a circular pressure campaign that risks eroding the coalition it depends on. The question for markets is whether the Trump-Xi summit proceeds on schedule; analysts at Eurasia Group say it remains on track for now, but warn that more aggressive US steps — such as restricting Chinese open-weight AI models or curbing Chinese firms’ access to chips through cloud services — would put the truce at risk^[6].

The third leg: Treasury yields and the Asian feedback loop

The oil shock and the trade war are stacking on top of a third pressure point: US Treasury yields at levels not seen since 2007. This week’s $42 billion 10-year note auction cleared at 4.683%^[8], and the fiscal backdrop — with annual interest payments on federal debt crossing $1 trillion^[8] — gives investors reason to demand higher compensation.

Asia sits squarely in the blast radius. The rupiah has dropped below its 1997 crisis levels^[8]; the rupee is trading around 95 to the dollar, down 6.2% year to date^[8]. Indonesia’s twin fiscal and current-account deficits, paired with Prabowo Subianto’s interventionist policies and the ouster of respected Finance Minister Sri Mulyani Indrawati, have left the economy exposed just as global risk appetite fades — MSCI is reportedly considering downgrading Indonesia from emerging to frontier market status^[8].

The connection to the other two stories is direct: higher oil prices widen the current-account deficits of oil-importing Asian economies, which weakens their currencies, which raises the cost of dollar-denominated debt service, which tightens financial conditions, which feeds back into capital outflows. Meanwhile, the US needs Japan and China — its two largest foreign creditors, holding $1.2 trillion and $659 billion in Treasuries respectively^[8] — to keep buying its debt. Washington’s fiscal trajectory, combined with its trade pressure on both countries, gives Tokyo and Beijing reason to hesitate. Any sign of that hesitation would ripple through the Treasury market and amplify the yield move.

What to watch next

• US sanctions announcement next week. Treasury Secretary Bessent has said further measures on Iran are coming. If the package targets secondary buyers of Iranian crude — including Chinese importers — the oil supply squeeze tightens further and the US-China trade flashpoint gains a direct energy dimension.
• Strait of Hormuz transit data. Watch the seven-day moving average from tanker-tracking platforms (Windward, Commodity Context). A drop below 7 million bpd would signal renewed escalation; a sustained climb above 10 million would suggest the partial reopening is holding.
• Trump-Xi summit status. The September visit remains the circuit breaker for the trade front. If the summit is delayed or cancelled — particularly after the transshipment report — the Busan truce effectively unravels and the tariff cycle re-accelerates.
• OPEC+ September output decision. The group has already approved a 188,000 bpd increase from September, completing the rollback of voluntary cuts^[4]. But as analyst June Goh noted, OPEC production can only meaningfully increase once Hormuz flows normalize^[3]. The quota hike is theoretical without the export capacity to deliver.
• Indonesia and India currency stability. If the rupiah breaks further and Bank Indonesia is forced into emergency tightening, or if the rupee’s slide accelerates past 96, the Asian feedback loop enters a more acute phase — the same pattern that preceded the 1997 and 2013 crises, now amplified by the oil-supply shock.
• 10-year Treasury auction demand. The next major auction will test whether Japan and China continue to absorb US duration at these yields. A tail in the auction — where the stop is materially above the when-issued yield — would be the first concrete signal that foreign creditor appetite is waning.