Eugenio Cusumano is Assistant Professor of International Relations at the University of Leiden, the Netherlands. He wrote extensively on non-state actors’ involvement in crisis management on journals like Security Dialogue and the Journal of Strategic Studies and edited volumes published by Palgrave, Oxford and Stanford University Press. Stefano Ruzza is Assistant Professor of Political Science at the University of Turin, Italy. He is also a Head of Program at T.wai - Torino World Affairs Institute, lectures in Italian Army advanced educational programmes, and is responsible for the Italian translation of the SIPRI Yearbook Summary.