Turkey will have to strike a balance between the conflicting goals of Russia and the United States if it is to achieve its ambition of a "safe zone" in northern Syria and build on an incursion which gave it control of a thin strip of the border.
Turkey has for several years called for world powers to help create a zone to protect civilians in its war-torn southern neighbor, with the dual aim of clearing its border of Islamic State and Kurdish militia fighters and of stemming a wave of migration that has caused tensions with Europe.