Two Straits, One Crisis: Brent's Triple-Digit Return and the Tariff Wall Converging on Markets

For the first time in the modern history of the global oil trade, the two most critical Middle East chokepoints — the Strait of Hormuz and the Bab el-Mandeb Strait — are under simultaneous attack. Yemen’s Iran-backed Houthis struck two Saudi crude tankers in the Red Sea on July 24, sending Brent crude above $100 per barrel for the first time since late May^[1]. This was not a one-off strike. It was the opening of a second front in a war that had already throttled Hormuz to a trickle, trapping Saudi Arabia between two closing chokepoints and confronting the oil market with what RBC’s Helima Croft called a “no way out” scenario^[2].

The timing could hardly be worse for risk assets. The same day Brent crossed $100, the 10-year Treasury yield climbed to its highest level since January 2025 at approximately 4.7%, while the 30-year at 5.17% entered its longest stretch above 5% since 2007^[1]. Then, at 12:01 a.m. ET on Friday, Trump’s new tariffs of 10% to 12.5% on 60 U.S. trading partners — accounting for 99% of American imports — took effect under Section 301 of the Trade Act of 1974^[3]. By Friday afternoon, Trump added a new threat: a “substantial” tariff on the European Union, launching a Section 301 investigation after the EU fined Google $1 billion under its Digital Markets Act^[4].

Three escalation vectors — energy supply, trade policy, and bond markets — converged in a single 24-hour window.

The Dual-Chokepoint Crisis

The Houthi strikes on Saudi tankers in the Red Sea did not happen in isolation. They followed the collapse of a memorandum of understanding signed by the U.S. and Iran on June 17 that was supposed to reopen the Strait of Hormuz. Since that collapse, daily vessel transits through Hormuz have plunged — preliminary ship-tracking data from Kpler showed just three transits per day over a three-day stretch^[5].

At least 61 commercial ships have been attacked in the Persian Gulf, Strait of Hormuz, and Gulf of Oman since March 1, according to the International Maritime Organization, resulting in the deaths of at least 17 seafarers^[2]. A dozen tankers were struck in July alone.

The Bab el-Mandeb strike created a cascading problem. Saudi Arabia had been diverting millions of barrels per day through its 1,200-mile overland Petroline pipeline to the Red Sea port of Yanbu specifically to bypass the Hormuz disruption. The pipeline terminates on the Red Sea — meaning the Houthi blockade of Bab el-Mandeb now threatens the very route Saudi Arabia was using to escape the other chokepoint^[2].

The Saudis can theoretically reroute through the SUMED pipeline across Egypt to the Mediterranean, but the logistics are punishing. Supertankers cannot transit the Suez Canal fully loaded because the channel is too shallow. They would need to unload half the cargo at Ain Sokhna, pipe it through to Sidi Kerir, send the partially loaded tanker through Suez, then sail the long route around Africa to Asian destinations. The roundtrip takes roughly eight weeks^[2].

A third front has opened in the Black Sea, where Ukraine says it has attacked more than 150 tankers, cargo ships, and other vessels associated with Russia’s shadow fleet in the Sea of Azov and Black Sea^[2]. The Caspian Pipeline Consortium suspended loadings at the Russian port of Novorossiysk due to Ukrainian attacks, jeopardizing Kazakhstan’s crude exports — which run about 80% through that pipeline. Kazakhstan’s energy ministry confirmed oil companies temporarily reduced production after the main Black Sea export terminal was forced to close^[5]. More than 50% of Russia’s refining capacity is now offline from Ukrainian strikes, and Russia has imposed an export ban on petroleum products^[2].

The net effect: three major oil-shipping corridors — Hormuz, Bab el-Mandeb, and the Black Sea route — are all degraded simultaneously.

Friday’s Pullback: Hope, Not Resolution

Crude prices fell sharply on Friday, with Brent settling at $96.78, down $3.91 or 3.88%, and WTI finishing at $89.31, down $2.88 or 3.12%^[5]. The trigger was a Reuters report that China had initiated a push to resume stalled peace talks between the United States and Iran.

“There’s nothing this market loves more than hope,” said John Kilduff, partner at Again Capital. “Nobody wants to get suckered, so any hint this may get settled they will take.”^[5]

But the weekly picture tells a different story. Brent remained on track for a gain of nearly 10% on the week, and WTI for an 8.27% weekly rise^[5]. Oil prices have surged more than 30% in July alone^[2].

JPMorgan analysts estimated that each additional month of disruption to oil supply would add around $7 to $8 per barrel to Brent, lifting monthly average prices to approximately $114 if disruptions extend to three months^[5]. In a worst-case scenario of full-scale regional war, Croft warned Brent could surpass the 2008 peak of $148 per barrel^[2].

Friday’s pullback was a sentiment trade on a diplomatic rumor, not a resolution of the physical supply disruption. Ships are still moving — UBS analyst Giovanni Staunovo noted that commodity vessel transits through Bab el-Mandeb totaled 32 on July 23, up from 26 the day before, and that “it’s not a complete blockade as some might have feared”^[5]. But the structural vulnerability remains: the chokepoints are contested, the alternative routes are slow and capacity-constrained, and the attacks are escalating.

The Tariff Wall, Rebuilt on Section 301

The new tariffs that took effect at midnight Friday represent the administration’s third attempt to maintain its tariff wall after the Supreme Court struck down the original IEEPA-based levies in February. The first replacement — 10% worldwide tariffs under Section 122 of the Trade Act of 1974 — carried a 150-day sunset, which expired on Friday^[3].

The new Section 301 tariffs are designed to be more durable. Section 301 was the legal basis for Trump’s first-term China tariffs, which survived court challenges. The administration is charging that 60 trading partners have inadequately enforced bans on goods produced by forced labor — a legal theory that, while expansive, is less likely to face the same judicial skepticism that felled the IEEPA tariffs. John Diamond of the Baker Institute noted: “It’s a little bit ridiculous to think that over 60 major trading partners, including countries in the EU, are really relying on that much forced labour. But I don’t think the courts will want to overrule these tariffs as they did the IEEPA tariffs.”^[3]

More tariffs are in the pipeline. U.S. Trade Representative Jamieson Greer’s office has launched a separate probe into whether 16 countries — accounting for 70% of U.S. imports — have overproduced goods, pushing down prices and putting U.S. companies at a disadvantage. That investigation has not yet concluded^[3].

The EU, meanwhile, signaled it could live with the new tariff schedule because Trump largely respected the transatlantic trade truce — but that detente lasted less than 24 hours. On Friday, Trump posted on Truth Social that the EU “will pay a very big price” for fining Google, and announced a formal Section 301 investigation into the bloc’s trade practices^[4]. The EU’s $1 billion fine — 890 million euros — was the first penalty under the Digital Markets Act, targeting Google for favoring its own apps and services over those of competitors^[4].

The threat matters because it signals the tariff wall is not a fixed structure but an expanding one, now reaching into the regulation of digital markets — an area previously untouched by trade policy.

The Bond Signal: Inflation’s Return

The bond market is transmitting the most unambiguous signal of all. The 10-year Treasury yield rose more than 4 basis points to around 4.7%, its highest level since January 2025, as surging oil prices rekindled inflation fears^[1]. The 30-year yield at 5.17% is in its longest stretch above 5% since 2007 — a period that preceded the global financial crisis.

The ECB kept rates unchanged on Thursday, but traders are now anticipating a rate hike in September after ECB president Christine Lagarde warned that renewed Middle East hostilities and the rebound in oil prices pose upside risk to the euro zone inflation outlook^[1]. Japan’s core inflation rate in June also crept up from a four-year low as higher oil prices fed through^[1].

The convergence matters because it compresses the policy flexibility central banks had been banking on. If oil remains elevated and tariffs raise import prices simultaneously, the Fed and ECB face a stagflationary bind: tightening to contain commodity-driven inflation while trade shocks weigh on growth.

Equities: A Rotation, Not a Rout

The stock market’s reaction was uneven. On Thursday, the S&P 500 and Nasdaq Composite had their worst single-day performances since June 23, falling 1.2% and 2.2% respectively, while the Dow dropped about 1% for its fifth negative day in six^[1]. The selloff was amplified by an AI spending reckoning that wiped roughly $500 billion off Tesla and Alphabet after both companies signaled increased AI investment^[1].

Friday’s session was mixed. The Dow gained 235 points or 0.46%, the S&P 500 was roughly flat, and the Nasdaq declined 0.64% as the Philadelphia Semiconductor Index dropped over 4%^[1]. Intel fell more than 7% post-earnings despite posting 25% revenue growth — its fastest since 2011^[1]. Energy and commodities led gains for the week, while tech and growth stocks faced significant selling pressure, with investors rotating into mid-caps, value, and commodity-linked names^[6].

Energy stocks were mixed. XOM closed at $156.94 on Friday, essentially flat^[7]. CVX closed at $194.79, up slightly^[7]. The United States Oil Fund (USO) closed at $136.69, down 2.8% as crude pulled back on the China-diplomacy report^[7].

The pattern — energy and value gaining while tech and semiconductors sell off — is consistent with a regime where higher oil and tariffs are repricing the cost structure of the economy. The rotation is the market’s early attempt to discount that regime.

What to Watch Next

1. Hormuz transit data. Kpler’s daily vessel counts are the fastest-read indicator of whether the strait is functionally closed or merely degraded. Three transits per day is a trickle; a return to double digits would signal de-escalation.

2. China’s peace initiative. Friday’s 4% oil selloff was driven entirely by a Reuters report that China is pushing to resume U.S.-Iran talks. Whether that initiative produces a ceasefire framework or fizzles will determine whether Brent holds below $100 or retests the highs. Trump promised “major military punishment” for Iran after the Red Sea strikes, and U.S. forces have now completed 13 consecutive nights of strikes on Iranian targets^[1].

3. The USTR overproduction probe. Greer’s office is investigating whether 16 countries representing 70% of U.S. imports have overproduced goods^[3]. If that probe results in additional tariffs, the tariff wall rises another layer — with direct implications for import prices and the inflation outlook the bond market is already pricing.

4. The EU Section 301 investigation. Trump’s threatened “substantial” tariff on the EU over the Google fine opens a new front that links trade policy to digital regulation^[4]. The scope and timeline of that investigation will determine whether the transatlantic truce holds or breaks.

5. Kazakhstan’s production. The Black Sea terminal closure has already forced temporary production cuts. Sustained disruption to Kazakhstan’s 1.7 million bpd output would tighten an already strained global balance^[2].

6. The 10-year yield. At 4.7%, it is at its highest since January 2025. If oil reclaims $100 and the tariff regime pushes import prices higher, the bond market’s inflation warning will intensify. The 30-year above 5% since 2007 is not a historical curiosity — it is a signal about the long-term cost of capital in an economy facing simultaneous supply shocks.

This article is research commentary, not investment advice. No trades are placed or managed here.