This article explores the phenomenon of foreign fighters from multiple perspectives of Spanish Law, including military law, and the implications it might have in the field of international humanitarian law (IHL). The Spanish government’s approach to this phenomenon is also examined, with attention focused on the national strategic plan against radicalization. In sum, with domestic law as it is, while slight amendments to domestic civil and administrative law could be advisable in matters of citizenship revocation for those Spaniards by derivative rights and non-judicial passport withholding; recent criminal law amendments, however, might not only pose constitutional challenges but may, in the long run, be overlapping the traditional domain of IHL, as terrorism, after all, is phenomenon of delinquency, not soldiering.
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