Three Oil Chokepoints Are Closing at Once — and a Sanctions Bill Aims 100% Tariffs at Asia

The signal that should worry markets is not any single chokepoint. It is that three of them are active simultaneously, and a fourth front — a Senate sanctions bill that would impose 100% tariffs on countries buying Russian energy — is advancing through Congress at the same time. This is the kind of convergence pattern that precedes a break in correlated risk.

Iran Stops Tankers in Hormuz

Iran said on Friday it had stopped two vessels attempting to exit the Strait of Hormuz, with four other tankers turning back after its forces intervened. The Strait of Hormuz normally carries about one-fifth of the world’s energy shipments, and Iran has blocked most shipping through it since the start of the five-month-old U.S.-Iran conflict.^[1]

Iran’s army said it targeted U.S. military facilities in Kuwait and Bahrain on Friday in response to U.S. attacks, including a strike on Qeshm Island near the Strait. Kuwait’s military said it destroyed attacking drones with some damage from falling debris. U.S. Central Command confirmed U.S. forces are still blockading Iranian oil exports via the Gulf.^[1]

The Persian Gulf Strait Authority, an Iranian body managing the strait, said crossings remain impossible due to “continued aggressive actions by U.S. military forces.” Some ships have negotiated passage with Tehran, angering Washington. Oman has presented Iran with a plan backed by Gulf states to manage the strait, including collecting voluntary transit fees — Iran has publicly rejected it, but its foreign ministry says talks with Oman continue.^[1]

Houthi Maritime Embargo Opens a Second Front

Iran-aligned Houthi forces declared a maritime embargo against Saudi Arabia on July 20, opening a new front in the conflict. London’s marine insurance market widened its “high risk” zone in the Red Sea on Thursday to include more coastline adjacent to Saudi ports.^[1]

Saudi Arabia has proposed a multinational maritime defence coalition with 43 countries to protect shipping in the Red Sea, the Bab el-Mandeb Strait, and the Gulf of Aden. So far, 13 countries have expressed support.^[2] A growing volume of Saudi oil has been diverted north through the Red Sea toward the Suez Canal and the SUMED pipeline, while Asian customers face longer voyages around Africa.^[1]

Caspian Pipeline: The Third Chokepoint

The Caspian Pipeline Consortium (CPC), which exports oil mainly from Kazakhstan via Russia’s Black Sea port of Novorossiysk, has suspended operations again after drone attacks on two tankers on July 30 — only three days after Kazakhstan resumed exports following a prior week-long halt.^[3] The CPC is expected to announce whether it will halt oil operations indefinitely.^[2]

An extended CPC shutdown would remove roughly 1.4 million barrels per day of Kazakh crude from global markets, compounding the supply losses from Hormuz and the Red Sea.

The Graham Act: Sanctions as Trade Weapon

While the three chokepoint crises constrain physical supply, the U.S. Senate advanced the “Lindsey O Graham Sanctioning Russia Act of 2026” by a vote of 86 to 12 on July 28. Named for the late Senator Lindsey Graham, the bill grants the president authority under IEEPA to impose tariffs of up to 100% on exports to the U.S. from the top five purchasers of Russian energy — meaning China, India, and Türkiye are directly in the crosshairs. Tariffs of up to 500% can be applied to Russian imports directly.^[4]

President Trump on Wednesday ordered lawmakers to amend the bill to include tariffs covering Iran as well, which could expand the tariff net to countries buying Iranian oil — chiefly China. Analysts say this addition may deter Democratic support and delay passage, as the House is in recess until August 31.^[4]

The bill is crafted to survive the Supreme Court’s February 2026 ruling that invalidated many of Trump’s earlier tariffs. Because it is new legislation invoking IEEPA explicitly, it provides a stronger legal basis for presidential tariff authority than the executive orders the court struck down.^[4]

Critics, including Senator Maggie Hassan, argue the tariffs would be paid by American businesses and consumers. The U.S. Chamber of Commerce opposes the bill on the same grounds. Türkiye — a NATO ally — and major partners like Brazil and Singapore also buy Russian oil products and could be caught in the net.^[4]

EU-China Trade War Escalates

The chokepoint-and-sanctions convergence is mirrored in a quietly escalating EU-China trade conflict. The EU added 14 Chinese companies to its Russia sanctions list on July 24 — carefully omitting major Chinese actors to ensure member-state support. Beijing retaliated within 24 hours with just a one-hour warning, adding 14 EU defense organizations to its own export-restriction list, including Rheinmetall, Europe’s largest defense company.^[5]

The Chinese measures carry an extraterritorial reach that the EU’s own sanctions lack: the listed firms are also cut off from receiving the same Chinese-origin materials via overseas suppliers. Brussels officials fear a chilling effect through European defense supply chains.^[5]

Market Reaction: Oil Up, Yields Up, Equities Split

Benchmark Brent crude futures rose more than 1% on Friday and are on track for a 23% gain in July. WTI traded near $85 per barrel, with Brent near $90.^[6] A Reuters survey of 31 economists and analysts projected Brent averaging $85.22 per barrel in 2026, up from the prior forecast of $84.50, with analysts expecting geopolitical risk to sustain volatility through the second half of the year.^[2]

The futures curve is flashing tightness: the September-to-October WTI spread closed Thursday at a $2.79 premium, up 37 cents — a backwardation structure that signals the market places a premium on barrels available sooner rather than later.^[2]

Energy stocks diverged on the day. CVX closed at $196.87, up 2.37% as of 16:00 ET, while COP rose 1.22% to $120.48 and continued higher in after-hours trading to $121.67 as of 20:00 ET.^[7] USO gained 1.33% to $129.17.^[7] XOM bucked the trend, slipping 0.96% to $155.46.^[7]

Meanwhile, the 10-year Treasury yield jumped to 4.73%, its highest level since January 2025, as investors sold Treasuries following the Fed’s decision to hold rates steady without forward guidance.^[6] Higher oil prices and higher bond yields simultaneously is a combination that historically compresses equity risk premia — even when tech earnings power the headline indices higher.

And power them they did: the Nasdaq rose roughly 1% as Amazon surged 15% on earnings and Microsoft followed up on its own 15% rally from Thursday. The four hyperscalers — Amazon, Microsoft, Meta, and Alphabet — now forecast cumulative 2026 capital spending of $720 billion to $745 billion.^[6] But that capex number is itself energy-demand intensive, and rising oil and power costs are a direct input to the AI infrastructure buildout.

The Strategic Petroleum Reserve Constraint

The U.S. has been releasing oil from the Strategic Petroleum Reserve to bridge the supply gap, but Energy Secretary Chris Wright said the government is not considering further large drawdowns after the current 172-million-barrel release is completed. The reserve currently holds 307.7 million barrels — its lowest level in four decades.^[2]

This matters because the SPR has been the primary policy tool for smoothing supply shocks over the past year. Once that buffer is depleted, the only remaining levers are demand destruction (higher prices slowing the economy) or diplomatic resolution of the underlying conflicts — neither of which operates on a market-friendly timeline.

The Convergence Risk

The quiet indicator here is not the price of oil on any given day. It is the simultaneous activation of three maritime chokepoints — Hormuz, Bab el-Mandeb, and the Black Sea CPC terminal — at a moment when a Senate-passed bill would give the president statutory authority to impose 100% tariffs on the world’s largest oil buyers, and when the EU and China are escalating counter-sanctions against each other’s defense supply chains.

Each of these threads could resolve independently. Hormuz transit could resume under the Omani proposal. The CPC could restart loadings. The House could strip the tariff provisions from the Graham Act. EU-China tensions could stabilize before October’s crunch negotiations.

But the pattern that warrants attention is their simultaneity. When multiple supply-shock vectors activate at the same time, the probability of a non-linear market reaction — where small additional disruptions produce outsized price moves — rises materially. The 23% July Brent rally is the first-order market read. The 4.73% 10-year yield is the second-order read: bond markets are beginning to price the inflationary consequences of sustained energy scarcity. The third-order question, which cannot yet be answered, is whether equity markets continue to look through this — or whether the combination of rising energy costs, rising yields, and rising geopolitical tariff risk eventually forces a re-rating.

What to Watch Next

• CPC decision: The Caspian Pipeline Consortium’s announcement on whether operations will halt indefinitely. An extended shutdown removes ~1.4 million bpd of Kazakh crude from global supply.^[3]
• House reconvenes August 31: The Graham Act’s tariff provisions face their next test in the House, where the Iran-expansion amendment and concerns about NATO ally exposure could reshape the bill.^[4]
• Oman-Iran Hormuz talks: Whether Iran accepts a managed-transit framework with voluntary fees — the only diplomatic off-ramp currently on the table for Hormuz.^[1]
• Saudi maritime coalition: Saudi Arabia has proposed a 43-country coalition with 13 expressing support so far — its formation and rules of engagement would directly affect Bab el-Mandeb security.^[2]
• SPR depletion timeline: The current 172-million-barrel release is finite. Once it ends, the policy buffer for supply shocks disappears.^[2]
• EU-China October negotiations: Beijing’s retaliation against Rheinmetall and other EU defense firms sets the stage for a decisive round of trade talks in October.^[5]
• 10-year yield trajectory: If oil prices remain elevated and the 10-year holds above 4.70%, the yield becomes a binding constraint on equity valuations regardless of earnings strength.^[6]