Iran plans new Gulf exclusion zone as US and Iranian forces trade fire, oil nears $100

Iran said this week that it will draw a new maritime "exclusion zone" across the mouth of the Persian Gulf, threatening to blacklist any ship that enters it, days after Iranian forces fired ballistic missiles at a United States aircraft carrier and a guided-missile destroyer and Washington answered by disabling or destroying three Iranian oil tankers. Brent crude reached $99 a barrel on Tuesday, its highest level since before the war reignited, as the six-month-old conflict over the Strait of Hormuz showed no sign of a diplomatic exit.

The exchange over the weekend was the sharpest since a ceasefire brokered in June collapsed. Iran's Revolutionary Guard Corps (IRGC) launched missiles toward the two U.S. Navy vessels on Saturday; both ships evaded the attack and no American personnel were hurt, according to U.S. Central Command, which said it responded within hours by permanently disabling two Iranian crude carriers and destroying a third.

A rapid, deadly exchange

CENTCOM said it hit the tanker M/T Downy off Kharg Island and the M/T Stark 1 near Jask, disabling both, and "completely destroyed" the unladen tanker M/T Kylo, also known as Noxen, in the Gulf of Oman. All three, the command said, belonged to a "multibillion-dollar shadow network" that funds the IRGC and its regional proxies. Admiral Brad Cooper, the CENTCOM commander, framed the strikes as a deliberate escalation of cost rather than a like-for-like response.

"If you shoot at two of our ships, we will impose an even higher economic cost — taking out three of yours. We will not hesitate to defend American forces, and if necessary, destroy Iran's limited and exposed oil fleet," Admiral Cooper said.

Iran's response came swiftly through its parliament speaker, Mohammad Bagher Ghalibaf, who said on Sunday that Tehran would no longer calibrate its retaliation to match the scale of any single U.S. strike. "The era of proportionate responses is over," he said, warning that further attacks on Iranian interests would draw a "faster, more intense and more painful" response. Hours later, Mohsen Rezaei, secretary of Iran's Supreme National Security Council, said Tehran intended to announce a new restricted zone that would "begin from the line of the U.S. naval blockade, extend toward the Strait of Hormuz, and from this side continue into the Persian Gulf." Any vessel that entered it, he said, would be placed on Iran's sanctions list. The precise coordinates have not yet been published, and officials have given only a general timeframe of "coming days."

Six months of escalation with no settlement

The current crisis traces back to February 28, when a wave of U.S. and Israeli strikes on Iranian nuclear and military sites opened what is now widely referred to as the 2026 Iran war. Iran responded with drone and missile attacks against Israel and, in following weeks, against Gulf states hosting American forces; Bahrain's foreign minister told the U.N. Security Council in July that his country alone had absorbed 808 attacks, including 203 ballistic missiles, since the war began. Washington imposed a naval blockade on Iranian ports in April, and Tehran retaliated by choking traffic through the Strait of Hormuz, the channel through which roughly a fifth of the world's seaborne oil and gas normally passes.

A memorandum of understanding signed on June 17 briefly halted the fighting and called for the strait to reopen, but the truce frayed within weeks and lapsed on August 17 without a follow-on agreement. Diplomats have struggled since to revive it. Meeting after the ceasefire's collapse in early July, U.N. officials warned that the standoff was drifting toward miscalculation; the Security Council was told that "each new strike, each new interception [and] each new maritime incident increases the risk of miscalculation." A Bahrain-and-U.S.-backed resolution demanding Iran halt attacks on shipping has stalled at the council after Russia and China blocked an earlier version in April, and the panel overseeing U.N. sanctions on Iran is due to review its mandate again this month, according to the Security Council Report's September forecast.

Washington has paired its naval action with a widening sanctions campaign against what it calls Iran's "shadow fleet" of tankers that move sanctioned crude while masking its origin. The Treasury Department announced sanctions last month on two Iranian-linked maritime insurance firms and eight tankers accused of financing the IRGC, with Secretary Scott Bessent saying "the regime is desperate for cash" and vowing Washington would not let Iran "hold global commerce hostage." That built on sanctions the State Department imposed in February against traders of Iranian crude, part of a campaign that has now targeted more than 100 vessels since the year began.

Shipping squeezed, sailors killed, prices climbing

The toll on commercial shipping has been mounting for weeks. Iran's Persian Gulf Strait Authority has built a formal blacklist of tankers it accuses of violating its rules for transiting Hormuz, expanding the list from 45 vessels in late August to 56 by early September, according to shipping-industry reports that tracked the additions; the list includes crude, LNG and LPG carriers tied to firms such as Abu Dhabi's ADNOC Logistics and Saudi Arabia's Bahri. Tehran has warned that any vessel found transferring cargo with a blacklisted ship can itself be added, and blacklisted ships risk fines, detention or seizure.

The human cost has fallen most heavily on the merchant sailors who keep the strait's dwindling traffic moving. On August 31, the Saudi-flagged tanker Sidr was struck by projectiles as it approached Hormuz; two of its Filipino crew were killed and a fire broke out that the remaining crew contained before Oman's navy evacuated the survivors. Traffic through the strait has fallen to roughly ten vessels a day, down from a pre-war average near 130, according to Tuesday's tracking cited by U.S. news outlets monitoring the crisis, effectively cutting off a route that once carried a fifth of the world's oil.

The financial effects have reached far beyond the Gulf. Brent crude, trading near $70 a barrel before the war, touched $99 on Tuesday morning, its highest level since the fighting resumed, according to market data reported alongside the CBS coverage. In the United States, regular gasoline averaged $4.15 a gallon on Monday — nearly a dollar above the same point in 2025 and above the previous Labor Day-period record — a politically sensitive rise for the Trump administration ahead of November's midterm elections. Analysts quoted by regional news coverage said Iran has calculated that sustained pressure on the strait, more than any single strike, is its most effective leverage against Washington.

No talks scheduled, both sides threatening more

Neither government has signaled interest in reopening negotiations. Iranian officials describe the campaign against Hormuz shipping as a matter of national survival, at times calling it an "existential war" waged against a country that can no longer rely on proportionate retaliation to deter attacks on its territory. U.S. officials, in turn, describe the tanker strikes as calibrated economic punishment intended to make continued attacks on American forces too costly for Iran's already strained economy to sustain. Neither framing points toward compromise.

Diplomats involved in the collapsed June memorandum say a revived truce would need to address the same issues that sank the last one: verification of any Iranian pledge to stop mining and interdicting shipping, and a mechanism to prevent low-level incidents from triggering the kind of rapid tit-for-tat seen over the weekend. Until then, shipping insurers, Gulf governments and oil-importing economies are bracing for Iran to formalize its promised exclusion zone in the coming days, a move that would test whether Washington enforces freedom of navigation through the very waters it has spent six months trying to keep open, or whether the strait's traffic falls even further. Reports from the region on Tuesday gave no indication that either side was preparing to step back before that happens.