: The author explores how global terrorist organisations have adapted to financial restrictions by collaborating with transnational organised crime to secure funding and resources. Impact on International Security

For more detailed academic reviews, you can explore the Spanish Yearbook of International Law or the analysis hosted by Dialnet .

Inmaculada Marrero Rocha's book, (Tecnos, 2020), is a comprehensive study on the evolution and impact of foreign fighters in contemporary international security. Key Themes and Analysis

: A significant portion of the work evaluates the political, legal, and administrative measures taken at national, European, and international levels to prevent fighters from leaving for conflict zones and to manage the security risks of those attempting to return.

: The book traces the shift from international terrorism to "global terrorism," highlighting how organisations like ISIS and al-Qaeda have leveraged virtual spaces to recruit and radicalise on an unprecedented scale.

: Marrero identifies modern foreign fighters as a distinct category, differentiating them from historical "libertarian heroes" seen in conflicts like the Spanish Civil War or the Greek War of Independence.