Foreign fighters remain a powerful jihadist force worth understanding.
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The United States has a range of options for its new Afghanistan policy.
Spain's close counterterrorism cooperation with Morocco provides a model for effective international efforts to prevent terrorist attacks.
The Syrian government got off the hook for facilitating the terrorist group's rise and funding its operations.
The presence of international terrorist groups may grow in the months and years ahead, but there are steps the United States can take to mitigate the risks.
In several countries, repatriated Islamic State members have not been held accountable. Their treatment has sparked controversy and raises security concerns.
The balance of power may be shifting, but not in favor of the Nigerian military.
Musa Baluku, a leader of a faction of the Allied Democratic Forces, has made clear his allegiance to the Islamic State.
Newly released documents provide additional insights about Abu Bakr al-Baghdadi's successor as leader of the Islamic State.