During his speech, Erdogan stressed that Turkish forces "are destroying the western wing of this corridor with the Idlib operation", referring to the artillery operation launched on the same day.
"More Kurds will serve in the areas in northern Syria".
The U.S. -led force will work with the Syrian Democratic Forces, which is aligned with Kurdish forces.
"Turkey will continue its resolute fight against all kinds of terrorist organizations within and outside its borders - regardless of whatever name or methods those groups use - as per the statements of Mr. President [Recep Tayyip Erdogan]", Kalin concluded.
"They will be providing border security through professionally securing checkpoints and conducting counter-IED operations", the office said, adding that coalition and SDF forces were still engaging remaining ISIL pockets in Deir Ezzor province. A senior Syrian Kurdish politician said last week that the United States appeared in no hurry to leave Syria.
"There is attacks and clashes on the border between Turkey and the People's Protection Units YPG", Hediye Yusuf said on Twitter.
A YPG spokesman in Afrin told The Associated Press news agency fighting broke out after midnight between his unit and Turkish troops near the border.
Listed as a terrorist organization by Turkey, the USA and the European Union, the PKK has waged a terror campaign against Turkey for more than 30 years, leading to the deaths of more than 40,000 security forces and civilians - including more than 1,200 since July 2015 alone, when it resumed its armed campaign against the Turkish state following a fragile cease-fire.
Rojhat Roj said the shelling of areas in Afrin district, in Aleppo province, killed one YPG fighter and wounded several civilians on Sunday.
She called Turkey's operation against Afrin a "violation" that "undermines worldwide efforts to reach a political solution in Syria".
YPG will fight to "defend our gains, our territories", Roj said.
"The base of the new force is essentially a realignment of approximately 15,000 members of the SDF to a new mission in the Border Security Force as their actions against ISIS draw to a close", it said.