Turkey sees the YPG as a terrorist off-shoot of Kurdish rebels in its own territory, but Western powers used the Kurdish forces as the main ground force against the Islamic State group.
In pictures: Turkish offensive in northern Syria
Syrian government forces enter the center of Manbij
Turkey sees the YPG as a terrorist off-shoot of Kurdish rebels in its own territory, but Western powers used the Kurdish forces as the main ground force against the Islamic State group.
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