ZeroFox Intelligence Flash Report - SITREP #35 - SoH Blockade

ZeroFox Intelligence Flash Report - SITREP #35 - SoH Blockade - April 23, 2026

Product Serial: F-2026-04-23a

TLP:CLEAR

In this Flash report, ZeroFox researchers report on the U.S. blockade of the SoH and fragile peace talks between the U.S. and Iran.

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Key Findings

On April 21, 2026, the United States unilaterally extended its ceasefire with Iran indefinitely while maintaining its blockade of the Strait of Hormuz (SoH). This followed several days of chaos in the SoH perpetrated by both sides, which was likely an effort to maximize leverage ahead of further talks. The United States and Iran will likely resume talks, but escalatory risks remain—especially as both sides maintain dual blockades of the SoH.
Measured military responses to these setbacks signal that both the United States and Iran are likely reluctant to return to armed conflict and instead prefer to utilize economic coercion to increase ceasefire pressure. Vessel seizures by the U.S. Navy are likely being used as coercive measures to get Iran to return to talks.
Since the terms of the ceasefire require the SoH to remain closed, all of the negative economic consequences seen during the all-out war will very likely worsen.
Iran’s Islamic Revolutionary Guards Corps (IRGC) publicly rejected concessions made by Iran’s civilian leadership, which has been present at talks in Islamabad. These divisions likely instill doubts that any agreements made by Iran will be upheld by the IRGC. This is likely an effort by the IRGC to influence talks to achieve a negotiated settlement that favors Iran's military-political establishment.
Because of the differences between the Iranian factions, Iran will likely require the United States to de-escalate—most likely by partially lifting its blockade—before returning to talks.
Before the recent setbacks, negotiation gaps had narrowed notably related to Israel-Hezbollah and Iran’s nuclear program. Gaps in both sides' negotiating positions likely remain elsewhere; as a result, the ceasefire is fragile.