Serhat Erkmen, a military expert at the Gendarmerie and Coast Guard Academy of Turkey, thinks that Turkish armed forces are targeting the ammunition depots and hideouts of the YPG that were already identified.
"We have reached a certain point in the process for the supplying of S-400 systems from the Russian Federation in order to meet our urgent air defense system needs as soon as possible", he said.
Turkey's defense minister and the USA -led military coalition in Syria confirmed the start of the patrols in Manbij, about 30 km (19 miles) from the Turkish border, on Thursday.
On Wednesday, the SDF said the Turkish attacks had forced it to suspend its US -backed campaign against Islamic State near the Iraqi border.
Turkish authorities have been pointing out a possible move on east of the Euphrates River, as it aims to free its borders from terror threat. Turkey launched the operation in 2016 and ended in 2017 to drive away Islamic State (IS, formerly ISIS) militants and the Syrian Kurdish YPG militia from its border with Syria.
In the multi-sided conflict, IS fighters have been driven from almost all of the self-proclaimed "caliphate" they controlled in Syria and Iraq by a range of foes including the US-led coalition, the Iraqi government, the Russian-backed Syrian government and Iran-backed paramilitaries.
Kurdish news agency Hawar News reported that the joint patrols took place 19 kilometers from the city with three United States and three Turkish vehicles, starting from the village of Arab Hassan.
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Mr Palladino said the United States was fully committed to Turkey's border security but at the same time expressed Washington's commitment to the Kurdish-dominated Syrian forces.
Ankara considers the YPG to be a "terrorist offshoot" of the Kurdistan Workers Party (PKK), which has waged a bloody insurgency in Turkey since 1984 with the goal of forming an independent Kurdish state. At the time, the SDF said it sent its fighters to defend the enclave, and accused Turkey of jeopardizing the anti-ISIS campaign.
Last week, IS jihadists staged a counterattack following a weeks-long SDF offensive in the countryside around Hajin.
USA and Turkish forces began joint patrols in a contested area of northern Syria, a long-promised but often delayed operation aimed at reducing tensions between the two North Atlantic Treaty Organisation members.
Beirut-based analyst Nour a-Din al-Omar, who recently conducted research in Kurdish-held areas of northern Syria, suggests that some Kurdish political and military officials fear that their forces could once again be left to fend for themselves.
Sharfan Darwish, spokesman of the Manbij Military Council, told The Associated Press earlier that the patrols were taking place on the front lines between his group and those of Turkey-backed factions in the operation called Euphrates Shield.