The United States is falling short on its obligations to friends in the region.
Daniel Byman is foreign policy editor of Lawfare. He is a senior fellow at the Center for Middle East Policy at the Brookings Institution, where he focuses on counterterrorism and Middle East security. He is also a professor at Georgetown University's School of Foreign Service.
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The loss of Raqqa is a blow to the Islamic State, and hard times are ahead for the group. But expect it to try to continue exploiting instability in the region and working to inspire or direct attacks abroad.
The practical effects of treating domestic terrorism like international terrorism give reason for caution.
Defining right-wing violence as terrorism is a complex proposition.
Jihadist organizations disagree on an array of matters, from how to handle those who fall short of "true" Islam to whether such groups should push to establish a caliphate.
The case against involvement focuses on the considerable cost of past U.S. efforts and the seeming futility of attempts to improve the situation.
Fear of resurgent terrorist activity is the main reason to remain in Afghanistan, but policymakers and strategists should view continued intervention as a means to a limited objective.