istanbul/beirut turkey lure militants away jihadist alliance control syria northwestern idlib province step toward implement deal reduce violence foreign minister mevlut cavusoglu say tuesday idlib one four de-escalation zone foreign power agree establish opposition territory western syria years civil war former al qaeda branch control province pledge keep fight syrian government force ally ex-nusra front stance raise doubt turkey one three party agreement proceed plan deploy observers inside idlib russia iran two countries involve due police edge cavusoglu say first stage already way separate moderate rebel terror organizations reference nusra cut tie al qaeda last year rebranded spearhead tahrir al-sham jihadist alliance dominate idlib comment endorse remark rebel source say efforts foreign state way encourage defections alliance break isolate reduce capacity oppose turkish military deployment regard nusra work weaken intelligence operations source tell reuters could include assassinations campaign undercut group popular support source say aim encourage jihadist fighters members al qaeda melt society .at least two million people live idlib large populate syrian area hold rebel include nationalist free syrian army factions sometimes fight alongside jihadists province population balloon thousands civilians combatants leave areas seize syrian army part country help russian jet iran-backed militias turkey already control swathe northern syria east idlib follow military incursion 2016. rebel source say 2,000 fighters train turkish force could deploy idlib many people close tie turkey could welcome turkish presence turkey call overthrow president bashar al-assad support several rebel factions recently work iran russia strong supporters assad stem violence syria six-year conflict compare array factions fight assad divide family cavusoglu say vital avoid indiscriminate bloodshed criticize continue russian syrian air strike idlib say kill civilians think family four sons say televise interview two members free syrian army everybody support one relate anything last one member terror organization bomb family kill mother father small children determine one separate others cavusoglu say work separate jihadists factions go rapidly need meticulous application would require broad international support tahrir al-sham form january hit recent months breakaway two significant fight factions nour el-din al-zinki jaish al-ahrar change leadership announce sunday abu mohammad al-jolani head nusra front assume command tahrir al-sham abu jaber al-sheikh quit post tahrir al-sham give reason resignation add statement al-sheikh appoint head shura council insurgent source northwest syria say ideological divisions group form tahrir al-sham big factor lead departure members turkey seek isolate syria idlib jihadists oppose truce