NATO leaders grappled Thursday with whether the alliance has a role in containing a mounting militant threat in the Middle East, as heads of state converged in Wales for a high-stakes summit also focused on the crisis in Ukraine and next steps in Afghanistan.
President Barack Obama and British Prime Minister David Cameron declared that their nations would "not be cowed" by extremists from the
Islamic State group who have claimed responsibility for killing two American journalists. They also challenged NATO to not turn inward in the face of the threat.
"Those who want to adopt an isolationist approach misunderstand the nature of security in the 21st century," Obama and Cameron wrote in a joint editorial in the Times of London. "Developments in other parts of the world, particularly in Iraq and Syria, threaten our security at home."