Primer

20 June 2025

Israel–Iran 12-Day War Primer (June 2025)

CSA’s One-Week Primer on the June 2025 direct exchange between Israel and Iran, published while the cycle was still active.
Satellite imagery of the Natanz nuclear facility in Iran, June 2025. Imagery from NASA FIRMS (Public Domain).

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Findings

  1. In June 2025, Israel and Iran fought a 12 Day War.

    The long shadow conflict between the two went kinetic in the open for the first time.

  2. Israeli operations targeted Iran’s nuclear, missile, and command infrastructure.

    Iran answered with ballistic-missile and drone barrages that crossed Jordan, Iraq, and Syria.

  3. The operation closed with direct U.S. strikes on Iranian nuclear sites.

    U.S. air-defense assistance to Israel was made public early in the war.

  4. CSA’s One-Week Primer was the first structured open-source briefing released.

    Published June 20, 2025 while the war was still ongoing.

  5. The exchange revealed the limits of Iran’s deterrent posture.

    And the readiness of regional partners to cooperate quietly with Israel and the United States in intercepting Iranian munitions.

Context

In June 2025, Israel and Iran fought a 12-day war that brought the long shadow conflict into the open. Israeli operations targeted Iran’s nuclear, missile, and command infrastructure (NYT, June 13, 2025NYT, June 14, 2025); Iran answered with ballistic-missile and drone barrages, including strikes that crossed Jordan, Iraq, and Syria (Reuters, June 20, 2025).

U.S. assistance with Israeli air defense was made public early in the cycle (AP, June 13, 2025), and the operation closed with direct U.S. strikes on Iranian nuclear sites (AP, June 21, 2025NYT, June 21, 2025). CSA’s One-Week Primer, published June 20, 2025, was the first structured open-source report released into the conversation.

What the Primer Covered

The primer was built for policymakers and stakeholders trying to follow the conflict’s military, diplomatic, and energy dimensions in parallel. Sections covered the Israeli operational sequence and the use of pre-positioned drones (AP, June 17, 2025), the Iranian response and proxy posture (Hezbollah, the Houthis, the Iraqi militias), the U.S. force-posture decisions, the regional reactions from the Gulf states and Turkey, and the immediate effects on Hormuz shipping, Brent pricing, and the European Liquefied Natural Gas (LNG) balance, including the temporary halt and limited restart of Israeli gas exports to Egypt and Jordan (Reuters, June 19, 2025).

The initial analytical inputs included the Washington Institute’s June 13 assessment.

What the Primer Confirmed

The primer became one of the most circulated CSA documents of 2025 and the foundation for the 2026 Iran War Report that followed nine months later. Its central observation: the 12-day exchange revealed the limits of Iran’s deterrent posture and the readiness of regional partners to cooperate quietly with Israel and the United States in tracking and intercepting Iranian munitions. That set the analytical frame CSA carried into the 2026 cycle.

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Published June 2025

Israel–Iran 12-Day War — One Week Primer

A sourced, footnoted primer produced inside seventy-two hours of the war’s opening. Chronology, U.S. role, regional response.
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The Council for a Secure America (CSA) is a nonpartisan, nonprofit 501(C)(3) educational organization. CSA educates on the link between U.S. energy security, national security, and diplomacy through original research, public-opinion polling, rapid response primers, and off-the-record briefings for policymakers, industry leaders, and civic institutions. CSA does not lobby or advocate for legislative or executive action.