ISIS Affiliate Linked to Moscow Attack Has Global Ambitions

Five years ago this month, an American-backed Kurdish and Arab militia ousted Islamic State fighters from a village in eastern Syria, the group’s last sliver of territory.Since then, the organization that once staked out a self-proclaimed caliphate across Iraq and Syria has metastasized into a more traditional terrorist group — a clandestine network of cells from West Africa to Southeast Asia engaged in guerrilla attacks, bombings and targeted assassinations.None of the group’s affiliates have been as relentless as the Islamic State in Khorasan, which is active in Afghanistan,…