The Obama administration on Monday began the work of trying to determine exactly what roles the members of its fledgling coalition of countries to fight the Islamic State in Iraq and Syria will play, with Defense Secretary Chuck Hagel huddled with the leaders of the one country the administration has called “absolutely indispensable” to the fight: Turkey . But after hours of meetings here, there were no announcements of what the government of President Recep Tayyip Erdogan might do. In fact, Turkish officials meeting with Mr. Hagel eschewed the news conferences that usually accompany high-level visits from American officials. Rather, Turkey ’s foreign minister, Mevlut Cavusoglu, warned on the state-run Anatolia news agency that weapons sent by Western countries to fight ISIS could end up in the hands of the Kurdistan Workers’ Party, or P.K.K., which Ankara considers a terrorist group. “We have expressed our concerns,” […]