ZeroFox Intelligence Flash Report - SITREP #27 - Military Strikes on Iran

ZeroFox Intelligence Flash Report - SITREP #27 - Military Strikes on Iran - March 23, 2026

Product Serial: F-2026-03-23a

TLP:CLEAR

In this Flash report, ZeroFox researchers report on the latest developments from U.S. and Israeli combat operations against Iran and how Iran is responding.

Standing Intelligence Requirements

For the most up-to-date list of ZeroFox’s Intelligence Requirements, please visit:

https://cloud.zerofox.com/intelligence/advisories/14956

Link to Download

View the full report here

Key Findings

On March 21, 2026, U.S. President Donald Trump issued an ultimatum to Iran, demanding the Strait of Hormuz (SoH) be opened within 48 hours. If the SoH is not opened by the deadline, with no threats to shipping, President Trump threatened to attack Iran’s power grid and power generation plants.
In response to President Trump’s ultimatum, Iran stated that, if its power grid is targeted, it will "irreversibly destroy” critical U.S. and Israeli infrastructure, including electrical facilities, energy and oil, and water desalination plants. Iran is very unlikely to acquiesce to U.S. demands. Iranian defiance will present President Trump with a choice of whether to follow through on his threats—which will almost certainly escalate the current crisis—or find a way to avoid escalation.
The SoH will very likely remain effectively closed for the foreseeable future, which will likely continue to deepen the current global economic problems. A continuing shutdown of the SoH will almost certainly have put more pressure on global oil prices, which continued to rise over the weekend—with Brent crude sitting above USD 110, as of writing.
Iran reportedly launched an intermediate-range ballistic missile at Diego Garcia, a joint U.S.-UK air base in the Indian Ocean. The missile, likely a modified variant of the Khorramshahr-4 intended for longer range, was intercepted by the U.S. Navy and failed to strike its intended target.
Israel and Iran traded strikes on nuclear facilities, with Israel reportedly striking Iran’s Natanz facility and Iran retaliating with attacks on towns near the Dimona nuclear facility. Strikes on nuclear sites are likely calculated to avoid radiation leaks and almost certainly to avoid nuclear escalation.