Chapter 7 sets out the key components of State responsibility under international law and then uses a series of case studies to demonstrate that responsibility in practice. Responsibility for a State’s negligent failure to prevent a terrorist attack looks at the acts and omissions of the Russian authorities with respect to the school siege at Beslan in 2003. Three cases have been chosen to exemplify the direct perpetration of terrorism by a State. The first case is the bombing by French agents of the Greenpeace boat, Rainbow Warrior, by French agents in New Zealand in 1985. The second involves certain acts of Syrian authorities following the protests related to the Arab Spring, in particular the widespread and systematic torture and summary execution of opponents of the regime. The third case is the conduct of Russian forces in Ukraine following its invasion on 24 February 2022. Examples of State responsibility as accomplices to acts of terrorism are the responsibility of Liberia for the actions of the Revolutionary United Front (RUF) in neighbouring Sierra Leone during the civil war and the potential responsibility of Syria for the murder of former Lebanese Prime Minister, Rafik Hariri, in Beirut on 14 February 2005.