After a month of silence, clashes resume: Why has the US-Iran conflict reignited, and how are markets reacting?
Original by Odaily Planet Daily (@OdailyChina)
Author｜jk
In the ongoing US-Iran conflict spanning nearly half a year, a military operation on August 30 (local time) broke more than a month of relative calm. The war, which began in February, had already entered an intermittent phase due to diplomatic mediation and economic sanctions strategies. But this weekend, the two sides exchanged fire once again, pushing Brent crude above $90 and dragging all three major US stock indices lower, putting markets back on edge.
Why the Conflict Reignited
The Direct Trigger: Mining Attempt in the Strait of Hormuz
On August 30 (Sunday), US Central Command confirmed that American forces struck Iranian rocket launchers deployed on Larak Island. Central Command spokesman Tim Hawkins stated that Iran's Islamic Revolutionary Guard Corps (IRGC) was preparing to lay mines in the Strait of Hormuz. This marks the first time Washington has publicly acknowledged military action against Iranian targets since late July.
Iran responded swiftly: Iranian state media claimed Tehran had launched missiles at US bases in Jordan in retaliation, with two bases reportedly suffering "heavy damage." The IRGC also claimed that a tanker attempting to pass through the southern edge of the strait was hit by two mines.
Background: Shifting from "Military Confrontation" to "Economic Strangulation"
This exchange of fire is notable because it breaks Washington's previous strategic shift. Since the last round of missile exchanges in late July, the US had been signaling that it would shift focus from direct military strikes to economic sanctions and blockades against Iran—applying pressure to Tehran through tightened sanctions and a sustained naval blockade to force it back to the negotiating table, rather than launching a new round of airstrikes. Trump had previously said the US would "just watch Iran drown in inflation, penniless," without rushing to escalate the war.
Meanwhile, Iran and Oman had reached a framework agreement on sharing revenue from tolls in the Strait of Hormuz, and markets had interpreted the situation as an economic stalemate, which is why Brent crude had fallen more than 5% over the past week.
The Trump "AI Video" Episode
On August 31, Trump posted a video on Truth Social, apparently generated by AI, claiming that Kharg Island—Iran's core crude export hub, which handles approximately 90% of Iran's oil exports—had been "blown to pieces." However, executives from Iran's National Oil Company publicly dismissed the claim as "ridiculous," saying Kharg Island was operating normally; US Central Command also did not confirm any strike on the island, only acknowledging "limited, precise strikes" targeting the mining operation near Larak Island.
Source: Truth Social
While this episode did not cause any substantive military escalation, it further stirred market expectations about the trajectory of the situation. Trump has previously made multiple public threats to "take over" Kharg Island and Iran's oil and gas markets, drawing parallels to the US approach in Venezuela.
Although the framework negotiations originally scheduled for early September remain on the agenda, Washington and Tehran remain publicly opposed on the core issue of "who holds the weapons." In other words, even with dialogue channels still open, the conflict has not truly cooled down. The exchanges of fire on August 30-31 look more like another friction point within this fragile stalemate, and it remains unclear whether Iran will pursue further retaliation or declare this round of responses concluded.
Market Impact
Oil Prices: Surge on the News, Breaking Back Above $90
- Brent crude closed around $90.69 per barrel on August 31, up 2.93% on the day; WTI crude rose in tandem, approaching $86 per barrel.
- This gain reversed the previous decline driven by the view that "the Iran situation is an economic sanction issue rather than a supply threat"—over the prior week, Brent had fallen to around $89.3, with a cumulative weekly decline exceeding 5%.
- On a longer timeframe, Brent crude is currently up approximately 33% year-over-year, with a gain of about 8% over the past month. Oil production in the Gulf region remains significantly below pre-war levels (according to Goldman Sachs estimates, current Persian Gulf exports are around 15-16 million barrels per day, versus 22-24 million barrels per day before the war).
Brent crude spikes higher. Source: Hyperliquid
US Stocks: Energy Shares Strengthen, Broader Market Impact Limited
August 31 (Monday) closing:
- S&P 500 fell 0.33% to 7,686.14
- Nasdaq Composite fell 0.12% to 26,370.89
- Dow Jones Industrial Average fell 374.09 points (-0.7%) to 53,185.90, dragged down mainly by Goldman Sachs and Alphabet
Notably, despite Monday's losses, all three major indices still closed higher for the month of August: the S&P 500 rose 2.6% for the month, the Nasdaq gained 3.9%, and the Dow rose 1.3% (its fifth consecutive monthly gain).
At the sector level: Energy stocks rallied on higher oil prices, with Halliburton up over 2.5% in pre-market trading, Chevron up 2%, Valero Energy and Occidental both up 2%, and Exxon Mobil up more than 1.5%.
Crypto-related stocks were mostly higher, with Bitcoin holding above $78,000, and Coinbase, Strategy, and CleanSpark all gaining between 1% and 2%.
