"At the direction of Secretary Mattis, the US established observation posts in the northeast Syria border region to address the security concerns of our NATO ally Turkey," the release said on Tuesday.
"We take Turkish security concerns seriously and we are committed to coordinating our efforts with Turkey to bring stability to northeastern Syria," Manning said in the release.
READ MORE: US Boosts Presence in NE Syria As Turkey Says No Daesh in Country
Turkey has been claiming that the YPG presence near its border hampers its national security. Earlier this year, it conducted an offensive against the Kurdish militia in Syria's northern border city of Afrin. Ankara is also currently engaged in an operation to eliminate Kurdish strongholds in northern Iraq.