The War Economy Begins: What a Widening US-Iran Conflict Means for Global Markets

The Mowing-the-Grass Plan Goes Kinetic

The United States has moved from signaling to striking. On June 1, US Central Command launched airstrikes against Islamic Revolutionary Guard Corps targets in southern Iran — hitting radar sites near Bandar Abbas, Chabahar, Konarak, Sirik, and the Keshm Island archipelago in the Strait of Hormuz. Iran’s southeastern Ziruft airport was also hit.

Within hours, Iran retaliated. Missiles and drones were launched at US military bases in the region. The IRGC confirmed it shot down a US MQ-9 Reaper drone using a newly deployed air defense system. The message from Tehran was unambiguous: an eye for an eye, not a negotiation tactic.

What makes this escalation structurally different from previous flare-ups is the explicit willingness of both sides to escalate beyond calibrated deterrence. Donald Trump did not mince words on Truth Social after the strikes, warning that Iran would face a response at a “much higher level” and that “the biggest attack is still waiting.” He told Fox News that the primary targets were Iranian radar installations being rebuilt after earlier attacks, and he emphasized that the aircraft carrier George Washington was fully loaded and ready. The implication was not subtle: if Iran strikes again, a third wave could dismantle the state entirely.

Trump also dismissed the possibility of a deal. “An agreement with them is not worth the paper it’s written on,” he said. This is not the language of a president preparing for diplomacy. It is the language of one preparing for escalation.

Axios reported the day before that Trump and his senior staff were reviewing a “mowing the grass” strategy — periodic strikes designed to keep Iran’s missile and radar capabilities degraded. If true, Thursday’s strikes were not a precursor to something larger. They were the thing itself.

Iran’s Internal Split: Hawks vs. the SCO Stage

While the IRGC was launching retaliation, Iran’s president was on a different stage. Masoud Pezeshkian attended the Shanghai Cooperation Organization summit in Bishkek, Kyrgyzstan, and made a surprisingly conciliatory pitch. He said Iran would resume compliance with the June Memorandum of Understanding if the US honored its obligations first. That MOU, brokered by Pakistan, called for an immediate ceasefire followed by 60 days of peace negotiations. Pezeshkian noted the US had violated it within two weeks.

He also met privately with Pakistani Prime Minister Shehbaz Sharif, saying continued warfare was not in Iran’s interest.

This dual track — fists raised in Tehran, hands extended in Bishkek — is not new for Iran’s leadership. It is a long-standing pattern. But the timing is telling. Pezeshkian’s diplomatic overture came while Iranian missile batteries were tracking US drones. The message to Washington was probably meant for domestic consumption as much as for American ears: Iran is capable of fighting, but it would prefer not to.

The IRGC, however, has the louder voice right now. And its actions suggest it sees far more advantage in escalation than in retreat.

The Economic Cascade Begins

The kinetic exchange is only the beginning. The financial markets are already pricing in a risk premium, and they are understating it. Oil surged 5% on the news. That may look modest compared to the spikes of 1990 or 2022, but it is the opening move. The real question is whether the Strait of Hormuz remains open.

Approximately 21 million barrels of oil per day — roughly a fifth of global consumption — transit through the strait. Iran has previously mined the water, seized tankers, and threatened shipping in the area. The US strike targeted Keshm Island, which sits directly in the strait’s shipping lane. If Iran views this as a direct threat to its leverage over global energy flows, the next target will not be radar installations. It will be the chokepoint itself.

A sustained disruption of Hormuz would push Brent crude well past $120 a barrel within weeks. The energy shock would not stay contained in the Middle East. It would feed directly into inflation. Central banks that have spent the past two years convincing markets they have tamed price growth would be forced to choose between tightening further and accepting a second wave of cost-push inflation. The Federal Reserve’s preferred gauge, core PCE, is already sticky. A sustained oil spike would make it worse, rapidly.

Bond markets would react first. The yield curve would steepen as short-term rates climb on inflation expectations while long-term rates rise on fiscal risk. The US deficit is already on an unsustainable trajectory; a major Middle Eastern war adds another hundreds of billions in defense spending that markets will price in almost immediately. European sovereign debt, particularly Italy and France, would come under pressure from both energy costs and stagnant growth.

Equities would fragment. Defense contractors and energy producers would surge. Airlines, logistics companies, and consumer discretionary firms would bleed. The S&P 500 could easily shed another 10 to 15 percent from current levels if Hormuz is disrupted, with the drop accelerating rather than staging in clean waves.

Portfolio managers are already moving. Risk parity funds that have dominated allocations since 2020 are being rewired. Commodities are re-entering portfolios that abandoned them after the 2022 sell-off. Gold is testing new highs not because of dollar weakness but because of systemic uncertainty. The era of cheap money is not coming back this year.

Who Wins, Who Loses

No rational actor wins from this escalation. But some lose less than others.

Iran’s military apparatus takes the sharpest hit in the short term. The IRGC’s radar network, missile production facilities, and air defense coordination centers were the stated targets. Yet Iran retains asymmetric leverage: the strait, proxy militias across the region, and the ability to escalate indefinitely without needing conventional parity. The regime’s survival calculus does not depend on winning a traditional war. It depends on making the cost of war unacceptable for Washington.

The United States wins nothing strategically from this exchange. Trump has framed the strikes as punishing Iranian aggression and protecting freedom of navigation. But the strikes have achieved the opposite of their stated goal: they have unified Iran’s fractured leadership behind the IRGC’s hardline posture and destroyed the diplomatic framework that Pezeshkian was still trying to salvage. The MOU is dead. Pakistan’s mediation is irrelevant. There is no off-ramp visible from either side.

Global consumers and investors lose the most. The inflationary impulse from an oil shock hits emerging markets hardest. Countries that import nearly all their energy — India, Turkey, Japan — face balance-of-payment pressures that could force brutal policy choices. China, Iran’s primary economic lifeline, is unlikely to intervene militarily but will feel the pain through disrupted trade routes and higher energy costs.

What Comes Next

Three scenarios dominate the thinking among strategists.

The first is limited attrition: periodic US strikes on Iranian military targets, occasional Iranian retaliation against regional bases, and no closure of the strait. This is the baseline if both sides are content with signaling rather than escalation. Oil stays elevated but contained. Markets breathe easier but remain nervous.

The second is proportional escalation: Iran closes or severely disrupts Hormuz in response to further US strikes, triggering a sharp oil spike and a global recession risk. The US responds with更大 airstrikes, potentially against Iranian nuclear or command infrastructure. This is the scenario Trump is hinting at with his “biggest attack is still waiting” warning.

The third is the unexpected de-escalation: domestic pressure in Iran, a change in US political calculus, or a third-party intervention forces both sides back to the table. This remains possible but increasingly unlikely given Trump’s rhetoric and the IRGC’s momentum.

The window for the third outcome is closing. Pezeshkian’s SCO appearance was a gesture, not a strategy. Trump has burned his diplomatic bridges publicly. The IRGC has proven it can strike back. Each day that passes without a ceasefire makes the next escalation more likely and the next de-escalation harder to achieve.

Global markets are already pricing in a war premium. They will price in a Hormuz closure much faster. The question is not whether this escalates further. It is whether anyone left standing can afford the bill.