beirut syrian kurdish militia accuse turkish force tuesday aggression escalation afrin region control syria northwestern border turkey ankara send force areas syria adjacent afrin oppose influence ypg militia see branch pkk movement wag three-decade insurgency inside turkey ypg spearhead syrian democratic force sdf alliance kurdish arab militias fight islamic state help u.s.-led coalition turkish president tayyip erdogan say last week turkey need cleanse afrin ypg monday ankara accuse attack observation post idlib province apparent response charge ypg say statement turkey spread several rumor force attack turkish land say turkey fire artillery machine gun several villages afrin monday turkey back incursion part syria immediately east afrin last year support anti-government syrian rebel factions lead frequent clash ypg last month ankara also send troop idlib south west afrin part deal agree russia iran set so-called de-escalation zone reduce fight syrian kurdish ypg accuse turkey afrin aggression