"Starting the long overdue pullout from Syria while hitting the little remaining IS (Islamic State) territorial caliphate hard, and from many directions. Will attack again from existing nearby base if it reforms," the President tweeted on Sunday.
Turkey views some Kurdish groups in the region as terrorist organisations and Kurds make up the majority of US-allied fighters operating in Syria in the civil war against Syrian President Bashar al-Assad's regime, CNN reported.
It's a stark threat toward an ally in the region that has partnered with the US in the fight against the IS.
Last week, Turkish President Recep Tayyip Erdogan publicly lashed out at US National Security Adviser John Bolton for saying the US withdrawal was contingent upon Ankara's pledge not to attack US-backed Kurdish fighters in Syria once troops leave.
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