The 60-day negotiation window between the US and Iran officially closed on August 17, with no agreement reached. After the market closed on Wednesday (August 19), US President Trump announced on Truth Social Media that he would impose "the toughest economic action ever taken against any country" on Iran, marking a full-scale shift in the US-Iran conflict from military confrontation to economic strangulation. This helped oil prices hold near the more than three-week high reached overnight; Brent crude was trading at $92.11 per barrel in early Asian trading on Thursday (August 20).

I. From Military Stalemate to Economic Strangulation: Trump Declares "Economic War"

On August 19, local time, US President Trump announced on his social media platform "Truth Social" that he would take "the toughest economic action ever taken against any country" against Iran, calling it an unprecedented "economic war and economic isolation." In his post, Trump stated that Iran's navy had been destroyed, its air force was in ruins, its military factories were reduced to rubble, and its currency "had become worthless," asserting that the regime was "teetering on the brink of collapse." Trump stated that any country that allows its financial institutions, businesses, airports, or government entities to provide a "lifeline" to Iran would face "enormous economic consequences." He specifically demanded the immediate severing of oil smuggling, currency swap lines, cash transfers, exchange bureaus, ship registry, and shell companies, and reiterated that "Iran will never have nuclear weapons." This announcement continues the pressure campaign launched by the Trump administration since April 2026 under the name "Operation Economic Fury." The operation, spearheaded by the U.S. Treasury Department, aims to sever the Iranian regime's global terrorist financing and revenue sources through asset seizures, bank account freezes, and pressure on foreign governments to cut off financial ties with Iran. Notably, Trump's statements regarding the economic war were markedly inconsistent. On August 18, Trump stated on social media that there would be "no talks or dialogues with Iran now or in the future"; however, on August 19, he changed his tune at the White House, saying that negotiations with Iran might resume "at some point," but only if Iran completely abandoned its nuclear weapons. This strategy of combining "maximum pressure" with a "negotiation window" continues the Trump administration's consistent approach to its Iran policy. Iran responded swiftly. Iranian Foreign Minister Abbas Araqchi accused Washington of further escalating sanctions after previous ones failed to force Tehran to yield, calling such actions "an obstacle to ending the conflict through negotiations." Mohammad Mokhber, advisor to Iran's Supreme Leader, stated that Iran remains willing to engage in dialogue with the United States, but "will not confuse negotiations with surrender." According to three Iranian officials, the Iranian leadership is concerned that further economic sanctions could exacerbate the plight of the people, reignite social unrest, and further undermine the legitimacy of the Islamic Republic.

II. The Strait of Hormuz stalemate continues, and the global energy artery is nearly severed.

As Trump announced his economic war, the navigation deadlock in the Strait of Hormuz continued. On June 18, the US and Iran remotely signed a memorandum of understanding, pledging to negotiate a final agreement within 60 days. The 60-day negotiation window set by the memorandum officially expired on August 17, with no substantial breakthrough achieved. On August 18, Iranian Parliament Speaker Qassem Ghalibaf clearly stated that the Strait of Hormuz would remain closed until the US met all the conditions in the memorandum—including lifting the blockade of Iranian ports, lifting oil sanctions, unfreezing frozen Iranian assets, and ceasing threats and military actions against Iran. Navigation data in the strait vividly reflects the severity of the situation. Data from ship tracking agency Kpler shows that only five merchant ships passed through the Strait of Hormuz on Saturday, August 15, and zero on Sunday, August 16, far below the pre-war normal flow of over 130 ships per day. Data from global ship tracking platform MarineTraffic shows that only three commercial vessels passed through the strait in the past 24 hours. Before the conflict, the daily traffic volume was approximately 110 to 130 vessels; now it has plummeted by over 90%. Four of the nine major container shipping companies have explicitly stopped using the strait, and at least 41 container ships, involving more than 200,000 TEUs of capacity, are stranded in the Gulf. Approximately 430 vessels are anchored or far from their berths, and war risk insurance rates have risen to 30 times the usual level. The US maritime blockade of Iran has forced 65 merchant ships to divert their routes before August 19. The UAE—one of Iran's most important business partners—has announced the suspension of all trade, personnel exchanges, and financial transactions with Tehran until further notice. The UAE claims this action was taken after two ballistic missiles launched from Iran struck its waters; Iran denies launching these missiles, calling the claim a "false flag operation." On August 19, the UK Maritime Trade Operations Office (UKMTO) reported that a vessel was struck by an unidentified projectile while leaving the Strait of Hormuz, resulting in damage to the engine room and injury to one crew member.

III. The energy market reacted sharply, with Brent crude oil briefly breaking through $92.

The continued blockade of the Strait of Hormuz and the escalation of Trump's economic war are directly reflected in energy prices. The strait transports approximately 20 million barrels of oil daily, accounting for about one-fifth of global consumption. Any supply disruption directly threatens energy prices and global inflation expectations. On Wednesday, Brent crude futures settled at $91.62 per barrel, up 60 cents, or 0.66%, after briefly breaking through $92 to reach a more than three-week high of $92.78 per barrel. West Texas Intermediate (WTI) crude futures for September delivery closed at $85.83 per barrel, up 89 cents, or 1.05%. Brent crude rose approximately 6% this week. Despite the price increase, prices did not remain above $100. Analysts believe the impact is being partially absorbed by inventory, transshipment, and alternative shipping routes. Saudi Aramco has resumed loading for buyers at ports within the Strait of Hormuz; between August 12 and 16, three Very Large Crude Carriers (VLCCs) each loaded 2 million barrels of crude oil at ports in eastern Saudi Arabia. Ship-to-ship transshipment near the port of Fujairah is also redirecting cargo around the Strait. However, costs are being passed on from crude oil prices themselves to freight rates, insurance rates, and diesel crack spreads—these are the channels through which the Hormuz risk first manifests. Data from the London Stock Exchange Group shows that seven very large crude carriers (VLCCs) owned by Saudi Bahri Shipping are currently anchored in UAE and Omani waters. Alternative routes around Africa have significantly increased transit times, doubling costs.

IV. US stocks remained calm, but inflation concerns emerged.

In contrast to the sharp reaction in the energy market, the US stock market reacted mutedly to Trump's announcement of an economic war. By the close of trading on August 19, the three major US stock indices had rebounded: the Dow Jones Industrial Average rose 0.22% to 53,463.05 points; the S&P 500 rose 0.22%. Following Trump's announcement, stock index futures rose slightly, with S&P 500 futures gaining less than 0.1%. The muted market reaction may be attributed to two factors: firstly, the market interpreted the economic war rather than military escalation as a signal that the conflict's intensity was manageable; secondly, investors were more focused on the inflation and interest rate outlook. However, the continued rise in oil prices is complicating the inflation situation. Data from the Iranian Statistical Center shows that Iran's annual inflation rate reached 66% in July, with consumer prices rising 87.9% year-on-year, and food prices rising even more sharply by 128% annually. If crude oil prices continue to climb, US inflation expectations may harden, leading the Federal Reserve to adopt a more cautious stance on interest rate cuts. Domestically, the nearly six-month-long conflict has begun to erode Trump's political capital. A poll released on August 17 showed that Trump's approval rating had fallen from 35% at the beginning of the month to 33%, a new low during his second term. The latest Pentagon estimates show that the US war against Iran has cost $37.5 billion to date, and the number of US military deaths has risen to 18. Continued war spending and rising gasoline prices are increasing the cost of living pressure on ordinary people.

V. Editor's Summary

After the 60-day window for negotiations between the US and Iran closed, Trump announced the "toughest economic action in history" against Iran, marking a shift in the conflict from military confrontation to economic strangulation. Traffic in the Strait of Hormuz has plummeted from over 130 vessels per day before the war to single digits, and Brent crude oil has broken through $92 per barrel, posing the most severe test to the global energy supply chain since the oil crisis of the 1970s. Market reactions have been relatively calm in the stock market, but the spillover effects of the continued rise in oil prices cannot be ignored—if Brent crude oil remains above $90, global inflationary pressures will further intensify, and the room for maneuver in monetary policy for major economies will continue to narrow. For Iran, an annual inflation rate of 66% and food inflation of 128% have placed enormous internal pressure on the regime to maintain stability; for the US, a 33% presidential approval rating and $37.5 billion in war expenditures are also testing domestic political patience. The stalemate in the Strait of Hormuz is unlikely to be broken in the short term, and the intensity of the economic war may escalate further, potentially leading to a longer period of uncertainty in the global energy and financial markets.

Frequently Asked Questions

Q1: How does Trump's announced "economic war" differ from previous US sanctions against Iran? A: Trump calls this "economic war" "the toughest economic action ever taken against any country." Its core differences are: First, comprehensiveness—it targets not only Iran itself but also any country providing financial, corporate, airport, or governmental support to Iran under "secondary sanctions," punishing third parties; Second, full coverage of channels—it specifically targets cutting off all possible funding channels, including oil smuggling, currency swaps, cash transfers, exchange bureaus, ship registration, and shell companies; Third, systemic nature—this is an upgraded version of "Operation Economic Fury" since April 2026, aiming to systematically destroy Iran's access to international financial services. Previous sanctions were mostly gradual pressure, while this is a strategic shift towards a "one-time, comprehensive strangulation." Q2: Why did the 60-day US-Iran negotiations break down? A: On June 18, 2026, the US and Iran remotely signed a memorandum of understanding, promising to negotiate within 60 days to reach a final agreement. The memorandum set conditions including lifting the blockade of Iranian ports, lifting oil sanctions, unfreezing Iranian assets, and ceasing military threats. However, within the 60-day window, the two sides failed to achieve a breakthrough on core issues—the US insisted that Iran must completely abandon its nuclear weapons, while Iran demanded the lifting of sanctions before discussing the nuclear issue. After the window expired, Trump stated that he had "no intention of extending it" and shifted to economic warfare on August 19. Iran, on the other hand, accused the US sanctions of being "an obstacle to negotiations." Question 3: What does the closure of the Strait of Hormuz mean for the global energy market? Answer: The Strait of Hormuz is the world's most critical oil shipping chokepoint, transporting approximately 20 million barrels of oil daily, accounting for about one-fifth of global consumption. Before the war, an average of 110 to 130 ships passed through daily, but currently, the number has dropped to single digits. The closure of the strait directly led to: First, rising oil prices—Brent crude has exceeded $92 per barrel; second, soaring transportation costs—war risk insurance rates have risen to 30 times the normal level; third, supply chain restructuring—65 merchant ships were forced to divert, bypassing Africa, doubling transportation costs. While inventory and alternative shipping routes provide some buffer, a prolonged blockade will severely impact global energy security and inflation expectations. Question 4: What is the current economic situation in Iran? Why did Trump call it "shaky"? Answer: According to data from the Iranian Statistical Center, Iran's annual inflation rate reached 66% in July, with consumer prices rising 87.9% year-on-year and food prices increasing by a staggering 128% annually. Families have been forced to drastically reduce their consumption of meat and other basic food items. Meanwhile, the US naval blockade has nearly shut down the Strait of Hormuz, reducing Iran's oil export revenue to almost zero. Trump stated in a post that Iran's currency has "become worthless" and that its navy and air force have been destroyed. Three Iranian officials revealed that the Iranian leadership fears further economic sanctions could exacerbate the plight of the people and reignite social unrest. The 2022 "Hoodie Revolution" has demonstrated that the combination of economic hardship and social discontent can trigger large-scale protests, which is Tehran's most pressing risk. Question 5: What are the medium- to long-term impacts of this escalation of economic warfare on financial markets? A: The medium- to long-term impacts are mainly reflected in three aspects: First, inflationary pressures—if Brent crude oil remains above $90, global inflation expectations will tend to harden, and major central banks such as the Federal Reserve will be more cautious about cutting interest rates; second, safe-haven assets—continued geopolitical uncertainty may drive funds to safe-haven assets such as gold; third, the dollar's performance—rising oil prices support the dollar, even as safe-haven funds push investors towards dollar assets. However, the stock market's short-term reaction has been muted, with S&P 500 futures rising less than 0.1%, indicating that the market currently interprets the economic war as "the intensity of the conflict is controllable." But if the Strait of Hormuz blockade becomes protracted, rising energy costs will gradually erode corporate profits, and the stock market's optimism may be unsustainable. At 09:08 Beijing time, Brent crude oil is currently trading at $92.14 per barrel.