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Terrorism and Irregular Warfare

The CSIS Warfare, Irregular Threats, and Terrorism Program collaborates with the International Security Program, Middle East Program, Africa Program, and more to provide analysis on irregular and hybrid warfare, terrorist violence, and military operations.

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Photo: Eyad Baba/AFP/Getty Images

Who Is Winning the Iran War?

The United States and Israel are devastating Iran's leadership and inflicting significant damage on Iran's already-weak military. Iran, however, is hitting back, and the biggest long-term costs to the United States are likely to be felt outside the Middle East.

Commentary by Daniel Byman — April 2, 2026

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Who Is Winning the Iran War?

The United States and Israel are devastating Iran's leadership and inflicting significant damage on Iran's already-weak military. Iran, however, is hitting back, and the biggest long-term costs to the United States are likely to be felt outside the Middle East.

Commentary by Daniel Byman — April 2, 2026