Attack in Russia: ISIS-K, the Afghan ultra-Islamic organization that seeks to lead terror. In January he committed an attack in Iran that left 84 dead.

He now reappears in Russia with equal brutality. Friday's attack in Moscow, like the assault on Iran in January, could prompt a reassessment of its ability to strike outside its territory. The K in its acronym refers to ancestral territories in Iran, Afghanistan, Turkmenistan and Tajikistan that the organization intends to conquer.