NOBEL PEACE PRIZE UPDATE: How a Secretive Branch of ISIS Built a Global Network of Killers.

The Islamic State’s attacks in Paris on Nov. 13 brought global attention to the group’s external terrorism network, which began sending fighters abroad two years ago. Now, Mr. Sarfo’s account, along with those of other captured recruits, has further pulled back the curtain on the group’s machinery for projecting violence beyond its borders.

What they describe is a multilevel secret service under the overall command of the Islamic State’s most senior Syrian operative, spokesman and propaganda chief, Abu Muhammad al-Adnani. Below him is a tier of lieutenants empowered to plan attacks in different regions of the world, including a “secret service for European affairs,” a “secret service for Asian affairs” and a “secret service for Arab affairs,” according to Mr. Sarfo.

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Allowing ISIS to metastasize from an unopposed “jayvee” in the deserts of the Levant and into a global menace might be the West’s worst unforced error since March 7, 1936, when France failed to confront a small force of nineteen German infantry battalions crossing the Rhine.