“This ceasefire is actually for Syria, for the sides that are within its borders," Davutoglu told journalists on Thursday.
"If threats arise against our national security from any of the sides, this ceasefire will not place its obligations on us. In such a case Turkey will ask no one permission and will do what needs to be done.”
Turkey has been heavily shelling the positions of Syrian Kurdish militants who are fighting Takfiri groups near the two countries' border.
Davutoglu said that Turkey would take “necessary measures” against the Kurdish People’s Protection Units (YPG) if need be.
Turkey says the Kurdish targets it hits pose a threat to its security. Ankara accuses the YPG of being behind a recent car bombing in the Turkish capital which killed 28 people. The group denies the charge.
The United States and Russia announced on February 22 that they had reached a deal for a “cessation of hostilities” in Syria, which would begin on February 27.
The Syrian government has said it accepts the terms of the deal on the condition that military efforts against Daesh and the al-Qaeda-linked al-Nusra Front continue.
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