U.S. President Barack Obama’s four-pronged strategy of air strikes

U.S. President Barack Obama’s four-pronged strategy of air strikes, support to local proxies, defense against the Islamic State’s attacks through intelligence and counterterrorism, and humanitarian assistance leaves many unanswered questions. It’s hardly a clear articulation of the sort of long-term, holistic strategy needed to deny the Islamic State the fertile ground it needs to thrive. The approach is fraught with trade-offs, risks, and hidden costs that need to be addressed.