Middle East — 2026-08-24

Iran Threatens to Block Strait of Hormuz If Gulf Neighbors Join US Sanctions Campaign

BLUFIran very likely sustains major Strait of Hormuz disruption through late September, but Tehran's escalatory leverage over Gulf neighbors rests on enforcement capacity it has not yet demonstrated.

Mohsen Rezaei, secretary of Iran's Supreme National Security Council, said Saturday that Tehran would target the interests of any neighboring country that joins the US "economic war," warning such states would first face negotiation, then be treated as hostile 123. He said Iran would allow no oil through the Strait of Hormuz or other Gulf export routes if that occurred, while stating the strait remains closed until Washington meets two conditions: ending all acts of aggression and ceasing interference in regional maritime traffic 2. Rezaei added Iran and Oman have agreed on a commercial transit route through the strait, though no joint statement has been issued and the route exists "only on paper" 2. Despite the closure, Iran has granted Iraqi oil tankers passage, and CNN reported strait traffic rose 27 percent over the past week to 20 percent of pre-war volume, citing UK Maritime Trade Operations Centre data 4.

Analysis
Iran very likely maintains significant disruption of Strait of Hormuz traffic through the next 30 days, with Rezaei reaffirming closure until Washington ends interference in regional maritime traffic and no sign of near-term reversal; the unformalized Oman transit arrangement leaves Tehran sole gatekeeper over exemptions like the Iraqi tanker passage. Threatened retaliation against Gulf states joining US sanctions would extend an existing disruption rather than start a new one, sharpening incentives for regional actors to hedge against a wider chokepoint. Confidence is low, resting on a single primary account (Press TV, with Middle East Eye, Al Jazeera, and CNN merely amplifying the same televised remarks) of unverifiable intent rather than independent indicators of enforcement capacity. Selective passage for Iraqi tankers and a reported 27 percent rise in strait traffic suggest the closure functions as calibrated negotiating leverage rather than an enforced blockade, and continuation keeps US Navy escorts and dark-transit workarounds in place while deterring Gulf states from formally joining Washington's sanctions push.

4 sources