Although terrorism does not represent a new concern, it keeps evolving and posing new challenges to both the international community and individual States. The efforts to adopt uniform and concerted actions, also in terms of new legal instruments, so far have produced varying and in some instances questionable results. One of the main issues is represented by the lack of a universally agreed-upon definition of terrorism, an issue that resonates also at the domestic level whenever States are called to implement further layers of the existing international counter-terrorism framework. The present article aims at discussing the problems that States face while adopting and enforcing international obligations to criminalise terrorist offences; most recently those connected to the foreign terrorist fighters (ftf s) phenomenon. This article will focus on Italy and it will analyse how the international norms to fight terrorism have been transposed in its domestic legislation and interpreted by its courts.

尽管恐怖主义不是一个新问题，但它不断演变，并对国际社会和个别国家构成新的挑战。迄今为止，采取统一和协调行动的努力，以及在新法律文书方面的努力，产生了不同的结果，在某些情况下是有问题的。主要问题之一是缺乏普遍商定的恐怖主义定义，每当要求各国实施现有国际反恐框架的其他层次时，这一问题也会在国内层面引起共鸣。本条旨在讨论各国在通过和执行将恐怖主义罪行定为刑事犯罪的国际义务时面临的问题；最近那些与外国恐怖主义战斗人员（ftf）有关的人s) 现象。本文将重点关注意大利，并将分析打击恐怖主义的国际规范如何在其国内立法中转换并由其法院解释。