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Turkey and the United States last month agreed on the so-called "security mechanism" to create a buffer between the Turkish border and Syrian areas controlled by the Kurdish People's Protection Units (YPG).

The YPG led the US-backed Syrian Democratic Forces (SDF) in battle against the Islamic State group in Syria, but Ankara views the Kurdish fighters as "terrorists".

The United States and Turkey launched their first joint patrol of the border areas on September 8, but Ankara has accused Washington of stalling in the week since.

A coalition delegation on Sunday met with members of a military council in Tal Abyad, a northern town from which Kurdish forces started withdrawing late last month.

"We are seeing good progress for the initial phase of security mechanism activities," the coalition said in a statement handed out to journalists.

"The coalition and SDF have conducted multiple patrols to identify and remove fortifications to address concerns from Turkey," the statement said.

"Four joint US and Turkish military overflights" by helicopter were also carried out, it said.

Little is known about the buffer zone's size or how it will work, although Ankara has said there would be observation posts and joint patrols.

"We will continue the removal of certain fortifications in the security mechanism area of concern to Turkey," the coalition statemeent said.

Riad al-Khamis, a joint head of the Tal Abyad military council, said the SDF had withdrawn from the area, to be replaced by the local forces.

He announced US-Turkish "joint patrols in the coming days to ensure the security of the border and the area".

Read more: Syria Weekly: Assad's outreach highlights regime's pariah status

"They will be joint patrols between the coalition or United States and Turkey in coordination with us, the Tal Abyad military council," he said.

"The coalition has promised to train the military personnel (of the council) - who are from this area - and support them logistically," he told reporters.

Turkey's President Recep Tayyip Erdogan has threatened to go his "own way" if the buffer zone was not set up by the end of September "with our own soldiers".

Foreign Minister Mevlut Cavusoglu on Tuesday belittled efforts to create the safe zone as largely "cosmetic".

Syria's Kurds have established a semi-autonomous region in northeastern Syria during the country's eight-year war.

Erdogan has repeatedly threatened to attack Kurdish-held areas in northern Syria, and the prospect of a US withdrawal after the territorial defeat of IS in March again stoked fears of an incursion.

Damascus labelled the first patrol last week as a flagrant "aggression" that seeks to prolong Syria's war.

Turkey has already carried out two cross-border incursions into Syria, the latest of which saw Turkish troops and Ankara's Syrian rebel proxies seize the northwestern enclave of Afrin last year.

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