"We warn the Turkish leadership that if they initiate combat operations in the Afrin area, that will be considered an act of aggression by the Turkish Army,"Syrian Deputy Foreign Minister Faisal Meqdad said in a statement reported by state media".
According to the Turkish General Staff, the operation aims to establish security and stability along Turkey's borders and the region as well as protect Syrians from terrorist oppression and cruelty.
On Monday, Erdogan talked to Russian President Vladimir Putin and his Iranian counterpart Hassan Rouhani over Turkey's ongoing operation, the fight against terrorist elements and the latest developments in Syria, particulary Afrin and Idlib.
Turkey has been operating against Kurdish militia's in the northwest region for several weeks in an offensive it dubbed "Olive Branch".
He asserted that the Kurdish self-governing administration in Afrin will not be compromised. But presidential spokesman Ibrahim Kalin had tweeted to say that reports suggesting that Syrian government had struck a deal with the YPG were not based on facts, adding that "dirty and secret negotiations were being held".
'Dozens' of Russians hurt in Syria attack, says ministry
I don't know", he said, according to a Pentagon transcript . "It hasn't in this case, thankfully, but it's unsafe ". Russia's foreign minister on Monday warned the United States against "playing with fire" in Syria .
The campaign, designated as illegal by the Syrian government, has met growing criticism even among Turkey's allies, including the United States, which backs the YPG and other anti-government forces in northern Syria.
Yildirim said Turkey's struggle with terrorist organizations and their extensions will last until "terror trouble" ends both at home and overseas.
Previously, the War Information Office of the Hizbullah organization reported that Syrian troops, mostly integrated by local units of the National Defense Forces, from the northern city of Aleppo, entered Afrin through the crossing of Al -Ziyara, north of the city of Nublu. But many argue Turkey would need Russia's backing in order to avoid confronting Syrian troops along with the YPG.
Two Turkish soldiers were killed on Wednesday in an attack by Kurdish militants in rural southeastern Turkey close to the border with Iraq, the army said.