The sound of shelling could be heard from Kilis city center, just kilometers from the Syrian border.

A Turkish official said on Tuesday that Ankara will ask its coalition partners, including the US, to take part in a joint ground operation in Syria. However, Turkey is adamant that it will not launch such an offensive on its own.

"Turkey is not going to have a unilateral ground operation. We are asking coalition partners that there should be a ground operation. We are discussing this with allies," the official told reporters at a briefing in Istanbul, as cited by Reuters.

"We want a ground operation. If there is a consensus, Turkey will take part. Without a ground operation, it is impossible to stop this war."

Turkish Prime Minister Ahmed Davutoglu said on Monday Ankara will not allow the town of Azaz in northern Syria to fall to the YPG forces.

"YPG elements were forced away from around Azaz. If they approach again they will see the harshest reaction. We will not allow Azaz to fall," Davutoglu told reporters on his plane bound for Ukraine, Reuters reported.

He said the Turkish military would render Syria’s Menagh airbase "unusable" if YPG forces do not retreat from the area, which they previously captured from Islamist militants. He warned the YPG not to move east of its Afrin region or west of the Euphrates River.

Turkey regards the YPG militia as a hostile insurgent force and is worried about the Syrian Kurds seizing more territory along the Turkish-Syrian border.