Trump Orders Hormuz Naval Blockade After 21-Hour Iran Talks Collapse

The Talks That Weren't

The Islamabad summit was supposed to be the off-ramp. Pakistan brokered the highest-level face-to-face meeting between Washington and Tehran since the 1979 Islamic Revolution, with Vance leading the US delegation and Iran's Parliament Speaker Mohammad Bagher Ghalibaf heading Tehran's. After 21 consecutive hours of negotiations, Vance told reporters: "The bad news is that we have not reached an agreement."

The sticking point was nuclear. Vance said the US needed "a fundamental commitment that they will not seek a nuclear weapon and they will not seek the tools that would enable them to quickly achieve a nuclear weapon." Iran chose not to accept those terms. Ghalibaf fired back that "the US has understood Iran's logic and principles, and it's time for them to decide whether they can earn our trust or not."

Vance left Islamabad after presenting what the US called its "final and best offer." Within hours, Trump was on Truth Social escalating.

The Blockade

Trump posted that the US Navy would "begin the process of BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz" and would "seek and interdict every vessel in International Waters that has paid a toll to Iran." The blockade was set to take effect at 10 AM ET Monday.

US Central Command quickly narrowed the scope, clarifying the blockade would affect only "maritime traffic entering and exiting Iranian ports" and that US "forces will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports." That distinction matters on paper — but on the water, the strait has been functionally closed since late February regardless. Only 24 ships passed through all of last week, and just two on Friday, neither of them oil tankers.

WTI crude jumped 8% to above $104 per barrel. Brent rose more than 7% to $103. Wholesale gasoline spiked 6%, and heating oil — a proxy for jet fuel — jumped 10% in early trading.

The Physical Squeeze

The headline price barely captures what's happening in physical oil markets. A backlog of roughly 3,200 vessels including around 800 oil tankers has accumulated near the western approach to the strait. About 400 loaded tankers are trapped inside the Gulf waiting to get out, while only around 100 empty tankers are trying to get in.

During the brief ceasefire window, just three supertankers managed to exit: the Liberia-flagged Serifos chartered by Thailand's PTT, and two China-flagged VLCCs — Cospearl Lake and He Rong Hai — both chartered by Sinopec's Unipec. Each carries 2 million barrels of capacity. Two other tankers that tried to transit on Sunday U-turned near Larak island after talks collapsed.

Cargoes for near-term delivery have reportedly changed hands above $140 per barrel as refiners scramble for any oil that's already outside the Gulf. JPMorgan noted that "reopening the Strait has become the market's most time-sensitive priority". The last tanker that loaded before the February 28 closure is expected to reach its destination around April 20 — after that, the pre-closure barrels are exhausted.

What This Changes

The ceasefire-to-blockade whipsaw in five days tells you where things actually stand: the diplomatic track is dead for now, and both sides are doubling down on Hormuz as leverage.

Trump framing this as a US blockade is partly theatrical — Iran has already been restricting the strait since late February. But the CENTCOM distinction between Iranian ports and general transit could matter if it holds. A US blockade of Iranian ports specifically would tighten the screws on Tehran's remaining oil exports while theoretically allowing Saudi, Emirati, Iraqi, and Kuwaiti crude to flow. In practice, insurers and shipowners are unlikely to send vessels through a contested chokepoint where both the US Navy and Iran's IRGC are operating, regardless of what CENTCOM says.

Gas prices have already risen $1.20 per gallon since the war began, hitting $4.12 nationally. The OPEC+ meeting on May 3 is the next scheduled catalyst — the group has to decide whether to accelerate production increases now that the crisis premium is firmly embedded rather than fading.

Trading on Hyperliquid

Trade OIL on Hyperliquid with up to 15x leverage.