Recent incidents of state terrorism, including the assassination of Kim Jong-Nam, the murder (and attempted murder) of persons with strong ties to Russia, and the Jamal Khashoggi assassination, demonstrate cruelty while implying the involvement of the state, unlike other acts of terrorism since the Second World War. This trend denies the efforts of the international community, which has suppressed physical punishment including the death penalty in modern times and has achieved advances in human rights and humanitarianism under contemporary international law. Accordingly, this paper utilizes Michel Foucault’s indications regarding prison to reconsider recent cases of state terrorism from a broader perspective while taking into consideration the historical background of conventional terrorism and the development of international terrorism-related treaties.