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PhD defence

Shunning Responsibilities and Shifting Risks: States’ Responses to the Foreign Terrorist Fighters Phenomenon & the Limits of Public International Law

  • I.D. Asscher
Date
Tuesday 10 March 2026
Time
Location
Academy Building
Rapenburg 73
2311 GJ Leiden

Supervisor(s)

Summary

Following the outbreak of the Syrian Civil War in 2011, tens of thousands of foreigners traveled to Syria and Iraq to join the Islamic State and other terrorist organizations. These individuals have been referred to as ‘foreign terrorist fighters’ (FTFs). What made the mobilization of such individuals unprecedented was, among other reasons, the extraordinary far-reaching responses by their states of origin. This research focuses on four such responses: (1) prevention of travel; (2) nationality deprivation; (3) (non-)repatriation; and (4) prosecution. It argues that, through these responses, states have essentially shunned their responsibilities and shifted security risks, as well as a burden to counter such risks, to other states and the Syrian Democratic Forces.

Such practices of pushing away burdens, responsibilities, threats and people perceived as unwanted are, however, neither new nor specific to the FTFs phenomenon, but are rather part of a broader pattern. Similar approaches can, for example, be identified within immigration and asylum policies. Using the FTFs phenomenon in Syria and Iraq as a case study, this research explores the extent to which public international law governs the shunning of responsibilities and the shifting of security risks, as visible in states’ responses to this phenomenon.

PhD dissertations

Approximately one week after the defence, PhD dissertations by Leiden PhD students are available digitally through the Leiden Repository, that offers free access to these PhD dissertations. Please note that in some cases a dissertation may be under embargo temporarily and access to its full-text version will only be granted later.

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