Turkey is signaling its willingness to use proxies to secure its interests in Syria’s Idlib Province, but the positioning of Russian and Syrian forces will limit the likelihood of deeper Turkish military engagement. In an address to legislators on Oct. 28, Turkish President Recep Tayyip Erdogan claimed that a recent attack against Turkish-backed rebel fighters in Idlib was proof that Russia was not interested in peace, as it deliberately undermined the tenuous cease-fire Ankara and Moscow reached in March. Erdogan also reiterated his government’s interventionist policy in Syria designed to clear Kurdish Workers’ Party (PKK) militants from Turkey’s border. ...