Islamic State of Khorasan, the group that claimed responsibility for the Moscow attack: 2,000 men and the dream of a "new caliphate" Terrorist groups start from the bottom, first with attacks on nearby targets, then expand their radius of action and prepare their men. Finally, if they can, they strike beyond the horizon.

Guido Olimpio: The history of terrorism repeats itself, perhaps in different forms, but the substance is always the same. The dynamics of Moscow attack are reminiscent of the Bataclan and Brussels airport massacres, conceived by assassins linked to Syria.