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Geopolitics & Markets Weekly

Week covered: Monday 28 September – Friday 2 October 2026 · Published Saturday 3 October 2026 · By Nitesh Soni

Key takeaways

1. The Iran war has become a contest of endurance, and markets are pricing it that way. Iran said on 30 September it had received a US response to its latest proposal ^{[1, 2, 3]}, but the two sides still disagree on what comes first: relief and an end to the blockade, or nuclear concessions ^{[4, 5]}. Washington is adding forces: three ships with over 7,000 sailors and 2,000 Marines are heading to the region, which could put three US carrier groups there by the end of October ^{[6, 7]}. Brent spot was $113.96 on 29 September, about 60% above its pre-war price ^{[8, 9]}. Neither side is moving towards a deal, so the war premium in oil stays.
2. Energy is being allocated by governments, not markets. Chinese refiners suspended fuel exports for October ^{[10, 11]}. G7 leaders agreed a release of 100 million barrels over four months with diesel front-loaded ^{[12, 13]}, from an IEA programme that has already used about 325 million of the 400 million barrels pledged in March ^{[14, 15]}. Producers are putting their own supply first, and the emergency cushion is thinning.
3. The US and China have a truce on trade and competition everywhere else. Each side will cut tariffs on about $30 billion of the other's goods, and the trade arrangement now runs to 10 January 2027 ^{[16, 17, 18]}. That arrangement keeps China's rare-earth export controls suspended and the US "Affiliates Rule" postponed ^{[16, 18]}. G20 trade ministers could not agree on industrial overcapacity ^{[19, 20]}. Both sides are holding their strongest weapons in reserve until January.
4. Washington is turning access to its market into an energy weapon. A new law requires tariffs of up to 100% on all goods from large buyers of Russian crude or gas from around 18 October, unless the President waives them ^{[21, 22]}. India's Russian crude imports fell in September to the lowest since April ^{[23, 24]}. The world's big crude importers now have to weigh discounted Russian oil against selling into the US.
5. The war is now priced into the world's cost of money. The US 10-year Treasury yield closed at 5.29% on 30 September, the highest since 2002 ^{[25, 26]}. Energy-driven inflation is spreading: euro-area inflation rose to 3.8% ^{[27, 28]}, and Iran's own currency hit a record low of about 2.5 million rials per dollar ^{[1, 29]}. War, oil, inflation and long-term interest rates now move together.
6. Friends are being pressed as hard as rivals. The US banned about $1 billion of Canadian goods from 29 September, on top of 50% tariffs on about $20 billion imposed in August ^{[20, 30, 31, 32]}. Brazil votes on 4 October under a 25% US tariff ^{[33, 34]}, and Indian goods face a 10% US duty ^{[35, 36]}. US trade policy is being used to change behaviour, not only to protect industries.

Mind, matter, money: the long game

The contest for the top of the world order runs on three pillars. Mind is technology: who designs and makes the chips, software and machines that set the pace of growth. Matter is energy, critical metals and food: who secures them, and who can deny them to others. Money is the dollar and the world's money markets: whose currency, debt and sanctions the rest of the world depends on. The US sits on all three. China is challenging it on each, and Russia, India, Japan, the EU and the Gulf are deciding where they stand. This week moved every pillar.

Mind: technology

• Both sides kept their technology weapons holstered. The trade arrangement to 10 January 2027 keeps China's rare-earth export controls suspended and the US Commerce Department's "Affiliates Rule" postponed ^{[16, 18]}. Rare earths are China's lever over Western electronics and defence; export controls are America's lever over China's chips. Neither is being pulled, and neither is being given up.
• The AI investment cycle is pulling capital towards the US and its suppliers. The IMF called AI investment "a positive impulse" against the energy shock ^[37]. Taiwan's TAIEX closed at a record and Japan's chip stocks led the Nikkei ^{[38, 39, 40]}. The US–aligned chip chain is where equity money is going.
• The fight over industrial scale is unresolved. G20 ministers reached no consensus on structural excess capacity ^{[19, 20]}. The US Trade Representative, chairing the meeting, said he was "disappointed that a handful of members rejected creating a pathway toward cooperative action" ^[19].
• Gained ground: the US and its chip-making allies in Japan and Taiwan. Held ground: China, whose rare-earth lever stays intact until January.

Matter: energy, critical metals and food

• Energy has become a security asset again. The war that began on 28 February keeps the Strait of Hormuz disrupted ^{[4, 14]}, unknown projectiles struck three vessels in the strait on 29 September, including a crude tanker ^{[41, 42, 43]}, and reports of tanker-tracking data disagree on how far Gulf crude flows have recovered, from about 7.4 to 13.5 million barrels a day through the strait ^{[44, 45, 46]}.
• China put its own fuel supply first: refiners suspended October exports of oil products ^{[10, 11]}. The G7 answered with reserves, front-loading diesel, the fuel the world is shortest of ^{[12, 13]}. New York Harbor diesel set a record of $5.365 a gallon on 16 September ^{[47, 48]}.
• Russia's oil revenue is the next target. The new US law reaches the five largest importers of Russian crude or gas over the past year ^{[21, 22]}. India, one of those buyers, is already shifting towards Middle East crude ^{[23, 24]}.
• Food is now handled as a weapon too. G20 trade ministers agreed a statement on "the weaponization of food through coercive trade actions" ^[19].
• The seven OPEC+ countries with voluntary cuts meet on 4 October and are expected to hold output ^{[49, 50]}.
• Gained ground: producers and countries with deep reserves, and China, which can switch its fuel exports on and off. Lost ground: importers with thin buffers, and Russia, whose customers now face a US penalty.

Money: the dollar, sanctions and global money markets

• The dollar system is both magnet and weapon. US yields at their highest since 2002 pull capital in, and the dollar index rose 0.95% on the week ^{[25, 26, 51, 52]}. Foreign investors sold Korean shares for six straight sessions ^{[53, 54]}.
• Treasury named firms in China, Hong Kong, Turkey, the UAE, Indonesia and Germany in a new round of Iran sanctions covering autos, rail, manufacturing, steel and finance ^{[55, 56]}. Access to the dollar is being used to police third countries.
• The new tariff law works like a secondary sanction: it punishes the customers of a sanctioned country through their access to the US market ^{[21, 22]}.
• China is running a different playbook: easier credit at home ^{[57, 58]} and a yuan up 4.3% against the dollar this year on ECB rates ^[59].
• The losers in the money contest are visible: Iran's rial hit a record low on 29 September, 27 days after the previous record of 2.2 million per dollar ^{[1, 29, 60]}, and the rupee is down 6.4% this year ^[59].
• Gained ground: the dollar and US financial power. Lost ground: currencies of energy importers and sanctioned economies.

Where the players stand after this week

How the week connected

1. Stalled talks → force and sanctions. With no agreement on sequencing ^[4], Washington sent more ships ^{[6, 7]} and widened sanctions ^{[55, 56]}.
2. Force → risk in the strait → oil. Three vessels, including a crude tanker, were struck in Hormuz on 29 September ^{[41, 42, 43]}, and Brent spot traded far above futures, at $113.96 on 29 September ^{[8, 68]}.
3. Scarce fuel → state action. China held its fuel at home ^[10] and the G7 opened its reserves, diesel first ^{[12, 13]}.
4. Oil → inflation → interest rates. Energy pushed euro-area inflation to 3.8% ^{[27, 28]}, and long-term yields rose across the large economies, the US 10-year to its highest since 2002 ^{[25, 26]}.
5. Rates → the dollar → everyone else. The dollar index rose 0.95% ^{[51, 52]}, money left Korea and India ^{[53, 69]}, and the rupee fell ^{[70, 71]}.
6. Trade law → energy routes. The Russian-oil tariff deadline pushed India further towards Gulf crude ^{[21, 22, 23, 24]}, adding to demand for the barrels whose route through Hormuz is still at risk.

Sources for the chart: ^{[8, 9]}.

What it means for you

• If you borrow. The war is keeping energy prices high, which keeps inflation and long-term interest rates high. A ceasefire would be the fastest route to lower borrowing costs; without one, today's long-term rates are the realistic planning assumption.
• If you hold cash. Short-term rates are high in most large economies, but cash held in the currency of an energy importer is losing value against the dollar this year: the rupee is down 6.4% ^[59].
• If you invest. Geopolitics is now a pricing factor, not background noise. Energy producers, defence suppliers and the AI chip chain are on the right side of this week's moves; energy importers and companies exposed to US tariffs are on the wrong side.
• If you run a business. Diesel is the cost to watch, and supply is in government hands: China decides when its refiners export again ^[10], and the G7 decides how fast reserves flow ^{[12, 13]}. Anyone selling into the US faces tariff risk tied to politics, from Canada to Brazil to India ^{[20, 34, 36]}.
• If you pay for fuel and food. Fuel prices now hang on decisions in Tehran, Beijing and G7 capitals. New York Harbor diesel set a record of $5.365 a gallon on 16 September ^{[47, 48]}, and energy pushed euro-area inflation to 3.8% ^{[27, 28]}. Food is being used as a trade weapon too ^[19]. A deal that reopens Hormuz would lower fuel prices first; escalation would raise them first.
• If you deal in more than one currency. Sanctions and tariffs move currencies. The yuan has risen this year, the rupee has fallen, and Iran's rial is at a record low ^{[1, 29, 59]}.

The detail

1. Iran: diplomacy stalls, military and sanctions pressure rises

What happened. Iranian officials said on 30 September that they had received an official US response to Tehran's latest proposal for ending the war, which began on 28 February ^{[1, 2, 3, 72]}. Foreign Minister Araghchi presented it to President Pezeshkian's cabinet, and officials did not say what it contained ^{[1, 2]}. Iran's "seven-day" proposal would reopen the Strait of Hormuz on day 6 and resume nuclear talks on day 7, in return for the US lifting its naval blockade, waiving sanctions on Iranian oil sales and observing a ceasefire ^{[4, 5]}. Trump publicly rejected it on 26 September ^{[4, 73]}. On 1 October he said Iran "is ready to fold up" ^{[41, 56, 74]}.

Force. The USS Theodore Roosevelt left San Diego for the Middle East on 27 September ^{[7, 72, 75]}. A US official told AP that three ships carrying over 7,000 sailors and 2,000 Marines are heading to the region, and that three US carriers could be there by the end of October ^{[6, 7]}. Unknown projectiles struck three vessels in the Strait of Hormuz on 29 September, including a crude tanker ^{[41, 42, 43]}.

Sanctions. On 1 October Treasury announced another round of "Operation Economic Outcast" against Iran's automotive, rail, manufacturing, steel and financial networks, with designated firms based in Indonesia, the UAE, Turkey, Hong Kong, China and Germany ^{[55, 56]}.

Knock-on effects. Talks that stall over sequencing, with more forces arriving, keep the risk premium in crude and the cost of shipping and insuring cargoes through the Gulf. Each sanctions round also raises the risk for third-country suppliers that still trade with Iran.

2. The diesel squeeze: China turns inward, the G7 opens its reserves

What happened. Chinese refiners suspended oil product exports for October, according to reports on 1 October; Beijing began its week-long holiday without giving major refiners approval to export beyond Hong Kong and Macau ^{[10, 11]}. On 2 October the G7 committed to "a coordinated release through the IEA of 100 million barrels (MB) to begin immediately over 4 months, including a frontloaded substantial diesel release within the first 20 days" ^{[12, 13]}. The IEA said about 325 million barrels of its 11 March collective action had been released, more than 80% of the 400 million pledged ^{[14, 15]}.

Markets. On Friday WTI fell $1.76 while Brent was almost unchanged, settling at $91.11 and $102.25 ^{[68, 76, 77]}. Market reports said recovering Middle East crude flows are easing fears of a crude shortage, while diesel and other refined products remain tight ^{[76, 78]}.

Knock-on effects. The shortage has moved from crude to refined fuel, which hits freight, farming, airlines and the inflation data central banks watch. When China's holiday ends on 7 October, its export decision matters as much as any OPEC+ quota ^[10].

3. US–China: a summit turned into lists, and a G20 split

What happened. On 28 September China's Commerce Ministry announced that each side will cut tariffs on about $30 billion of the other's goods, with around 90% of covered products moving to most-favoured-nation rates once domestic procedures are completed ^{[16, 18]}. The trade arrangement agreed in Kuala Lumpur, previously due to expire on 10 November, now runs to 10 January 2027 ^{[16, 18]}. The White House's terms of reference describe "lists of mutually agreed upon imported goods totaling roughly $30 billion on each side" ^{[17, 18]}.

The G20. At the trade ministers' meeting in Milwaukee there was no consensus on structural excess capacity or on forced labour ^{[19, 20]}. Ministers did agree a statement on the weaponisation of food through coercive trade ^[19].

North America. The US ban on nearly $1 billion of Canadian imports, including alcoholic drinks, dairy products and motorcycles, took effect on 29 September, after 50% tariffs on about $20 billion of Canadian goods in August ^{[20, 30, 31, 32]}.

Knock-on effects. The $30 billion lists matter for farmers and consumer-goods importers more than for the big economic numbers. The real stakes sit in the export-control truce: if it lapses in January, rare earths and chips become weapons again, with autos, defence and electronics most exposed.

4. The Russian-oil tariff deadline

What happened. The President signed the new sanctions law, Public Law 119-111, on 18 September ^{[21, 22]}. Section 113 requires him, "not later than 30 days after the date of the enactment", to raise duties on all goods from a covered country "to a rate of up to 100 percent ad valorem", so around 18 October ^{[21, 22]}. A covered country is one that keeps buying Russian crude or gas and was among the five largest importers by volume over the previous 12 months, or among the top five helping Russia evade oil sanctions ^{[21, 22]}. Section 115 lets the President waive any duty with a national-interest certification to Congress ^{[21, 22]}.

The first response. India's Russian crude imports fell in September to the lowest since April while imports from the Middle East rose ^{[23, 24, 79]}. Analysts at Kpler said the drop does not mean India is moving away from Russian crude altogether ^{[23, 24]}.

Knock-on effects. If big buyers cut Russian crude, they compete for Gulf and Atlantic barrels at market prices, without the discount Russian oil has carried, which lifts costs for every importer. If the President waives, the law becomes a bargaining tool rather than a blockade.

5. Also on the radar: Brazil votes on 4 October

What happened. Brazil holds the first round of its general election on 4 October, with a runoff on 25 October if no one wins outright ^{[33, 80]}. A Datafolha poll published on 1 October showed President Lula at 42% and Flávio Bolsonaro at 38% in the first round, and 48% to 45% in a runoff ^{[33, 81]}. Many Brazilian goods have faced a 25% US Section 301 tariff since 22 July ^{[33, 34]}.

Knock-on effects. The result decides how Brazil handles US tariffs, and where Latin America's largest economy leans between Washington and Beijing.

Key data table

Next week: decisions, options and what they lead to

Sunday 4 October: OPEC+ sets November output

Who decides: the seven OPEC+ countries with voluntary cuts ^{[49, 50]}.

• Hold output (expected ^[50]). Producers keep prices high without provoking consumers during a war; diesel stays the binding constraint.
• Raise output. A signal to Washington and importers; Brent eases and inflation fears soften.
• Cut output. A show of producer power; Brent jumps and the pressure on importers and central banks rises.

Most likely: a hold. Producers keep prices high and diesel stays the binding constraint, so energy importers and their currencies stay under pressure.

Sunday 4 October: Brazil's first round

Who decides: Brazilian voters ^{[33, 80]}.

• Lula wins outright. Continuity; the dispute over US tariffs continues on current terms.
• Runoff on 25 October, if no candidate wins a majority of valid votes ^{[33, 80]}. Three more weeks of uncertainty for Brazilian assets and for US–Brazil trade talks.

Most likely: a runoff on 25 October. No polling institute shows a first-round winner ^[33]. That means three more weeks of uncertainty for Brazilian assets and for US–Brazil trade talks.

What it tells you: whether Latin America's largest economy keeps its current balance between the US and China.

From 7 October: does China let fuel exports resume?

Who decides: Beijing, after its holiday ends ^[10].

• Exports resume. Asian diesel eases and the G7 release goes further.
• The suspension is extended. Diesel tightens into the northern winter, and China shows it will use fuel supply as a lever.

Most likely: the suspension holds through October. Beijing has tied exports to domestic stocks returning to pre-war levels, and stocks are well short of that ^[10]. So diesel tightens into the northern winter, and China keeps fuel supply as a lever.

What it tells you: whether China treats refined fuel as a commodity to sell or a resource to hold.

Iran–US talks and the build-up of forces

Who decides: Washington and Tehran, through Qatari and Pakistani mediators ^{[1, 86]}.

• A revised sequencing formula. Oil's risk premium falls first, then inflation expectations and long-term yields.
• Stalemate while forces build. The premium stays; up to three US carriers could be in the region by the end of October ^[6].
• Escalation. More attacks on shipping would send fuel prices and the dollar higher and hit importers hardest.

Most likely: stalemate while forces build. The two sides still disagree on what comes first, relief and an end to the blockade or nuclear concessions ^{[4, 5]}. So oil keeps its risk premium.

What it tells you: whether the war is heading for a negotiated end or a longer standoff.

12–18 October: IMF and World Bank meetings in Bangkok

What it tells you: the IMF's new World Economic Outlook puts numbers on the war's cost by region, and the meetings show how far finance ministers are coordinating on energy and debt ^{[37, 87]}. Larger downgrades for energy importers, or no joint line on energy, would confirm that the war's cost is falling hardest on them.

Around 18 October: tariffs on buyers of Russian crude

Who decides: the US President ^{[21, 22]}.

• Impose duties on covered countries. India and China would have to choose between Russian crude and the US market ^[88]; Russian revenue falls; oil costs rise for importers.
• Waive under the national-interest clause. The law stays a threat and a bargaining chip, likely traded for concessions in trade talks.
• Partial action. Targeted duties on some buyers, waivers for others, which splits the buyers.

Most likely: partial action, with the threat used as leverage. The White House has not said what rates or waivers it intends ^[89], and trade analysts expect Washington to use the threat to push buyers such as India to cut Russian purchases and offer trade concessions ^[90].

What it tells you: how far Washington will go in using market access to reshape the energy trade, and how much it will pay at home in higher fuel prices.

Where this is heading

Base case: a long standoff. No deal in Iran before the US midterms on 3 November ^{[91, 92]}, forces build, Hormuz stays risky and diesel tight into winter. The US–China truce holds to January. Oil stays near $100 on futures, higher on physical cargoes, and long-term interest rates stay high. Signposts: tanker incidents in the strait, China's fuel export decision, the 18 October tariff step.

Upside: a sequencing deal. A formula that reopens Hormuz in stages would cut the oil premium quickly, ease diesel, lower inflation expectations and pull long-term yields down. Energy importers' currencies would recover first.

Downside: escalation on two fronts. A clash in the Gulf together with a collapse of the US–China truce would combine an oil shock with a technology and rare-earth shock. That is the scenario markets are least prepared for.

The long run. The world is splitting into blocs on all three pillars. In technology, the US–aligned chip chain is pulling ahead while China keeps its rare-earth lever. In energy, states now ration fuel, hold reserves and punish each other's customers. In money, the dollar's pull is strengthening at the same time as its use as a weapon pushes others to look for alternatives. Countries that can secure their own energy, technology and funding will be paid for that security; those that cannot will pay for it.

Sources

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