تروریسم

If history is any guide, the networks of fighters forged by the Syrian war will not remain silent in the coming years.

Hezbollah's past operations in Iraq show that a limited number of experienced "consultants," working with Iran's Qods Force, could significantly increase the lethality of the local Shiite militias currently gearing up to counter the ISIS offensive.

Significantly undermining ISIS's financial base would require rolling back the group's access to local Syrian and Iraqi income sources.

Deborah Kalb interviews Dr. Levitt on Hezbollah's potential involvement in Iraq, its commitment to Iran, and other issues.

Why ISIS brags about its brutal sectarian murders in Iraq.

An expert on jihadist groups discusses whether ISIS will make more enemies than friends in Iraq as it continues its recent strategy of mixing violent repression with well-funded social work.

The civil war between Assad and his opponents has steadily transformed into a global jihad.

The group's approach to other areas it has seized -- a mix of harsh repression and soft-power outreach -- offers insight into how it might consolidate control in Mosul.

The Mosul crisis highlights how ISIS has established a potent cadre of foreign jihadists who freely operate across the rapidly disappearing Iraq-Syria border.