Foreign Fighters in the 2022 Russia-Ukraine War: An Assessment of Extremist Volunteers

This policy brief provides a risk assessment of the potential threats posed by violence-oriented extremists in the ongoing Russia-Ukraine war once they return to their prior countries of residence/homeland. The brief concludes with policy recommendations to quickly and comprehensive identify and share knowledge on this threat as well as disrupt the travel of violence-oriented extremists to Ukraine.

Authors: Alexander Ritzmann, Dr. Hans-Jakob Schindler, and Sofia Koller


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Extremists: Their Words. Their Actions.


On September 23, 2021, the Houthis began a siege on Marib’s al-Abdiyah district, sparking a humanitarian crisis as the rebels blocked medical and other humanitarian aid. Aid workers on the ground accused the Houthis of committing genocide by denying access to humanitarian organizations and shelling hospitals and other vulnerable civilian targets.   

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