WASHINGTON — Despite longstanding divisions, Kurdish political leaders and analysts say Syrian Kurdish groups are seeking a unified delegation to represent their interests in Damascus in negotiations with Syria’s new authorities. Since 2012, northeast Syria’s Kurdish region has been under the control of forces affiliated with the Syrian Democratic Forces, or SDF, a key U.S. partner in the fight against the Islamic State terror group. The region is predominantly governed by the Democratic Union Party, or PYD, whose military arm forms the backbone of the SDF. For its part, Turkey views all these groups as an extension of the Kurdistan