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. 

Photo: Wojciech Grzedzinski/Anadolu via Getty Images

Photo: Wojciech Grzedzinski/Anadolu via Getty Images

Russia’s Battlefield Woes in Ukraine

Russia has performed poorly on the battlefield in Ukraine and will likely hit the 1 million casualty mark in the summer of 2025. New CSIS data details Russia's slow rate of advance, heavy losses of equipment, and significant casualties.

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Brief by Seth G. Jones and Riley McCabe — June 3, 2025

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Photo: Anna Moneymaker/Getty Images

Photo: Anna Moneymaker/Getty Images

Can Ukraine Survive Without U.S. Aid?

June 5, 2025 • 11:15 am – 11:45 pm EDT
Video On Demand
Hosted by Warfare, Irregular Threats, and Terrorism Program
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Daniel Byman

Daniel Byman

Director, Warfare, Irregular Threats, and Terrorism Program
Seth G. Jones

Seth G. Jones

President, Defense and Security Department; Harold Brown Chair
Jon Alterman

Jon B. Alterman

Zbigniew Brzezinski Chair in Global Security and Geostrategy

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Can Ukraine Survive Without U.S. Aid?

Experts from CSIS’s Warfare, Irregular Threats, and Terrorism Program sat down for a discussion on the possible implications of a partial or complete suspension of U.S. military aid to Ukraine.

Event — June 5, 2025

Russia’s Battlefield Woes in Ukraine

Russia has performed poorly on the battlefield in Ukraine and will likely hit the 1 million casualty mark in the summer of 2025. New CSIS data details Russia's slow rate of advance, heavy losses of equipment, and significant casualties.

Brief by Seth G. Jones and Riley McCabe — June 3, 2025

Can Ukraine Fight Without U.S. Aid? Seven Questions to Ask

A complete cutoff of U.S. aid would significantly harm Ukraine’s ability to fight Russia but would not necessarily lead to immediate defeat—and more limited cutoffs would have more limited effects on Ukraine’s battlefield performance.

Report by Iselin Brady, Daniel Byman, Riley McCabe, and Alexander Palmer — May 19, 2025

Conflict in Focus: Lessons from Russia-Ukraine

The Russia-Ukraine War has redefined modern conflict, from drones and cyberattacks to contested space. Conflict in Focus, a CSIS series, unpacks key lessons across all domains of war—insights vital for anticipating and preparing for future large-scale conflicts.

Report by Matthew Slusher, Krista Auchenbach, Scott Murphy, Quinton Packard, Scott Pence, and Luke Slivinski — May 2, 2025

Global Terrorism Threat Assessment 2025

Terrorism remains a threat to U.S. citizens, assets, and interests despite the national security community’s decreasing focus on counterterrorism.

Report by Alexander Palmer, Riley McCabe, Daniel Byman, and Skyeler Jackson — March 28, 2025