Ankara, however, views the YPG as the Syrian branch of the Kurdistan Workers' Party (PKK), which Turkey, the US and European Union all consider to be a terrorist organization. For decades, the PKK has waged a bloody insurgency in Turkey.
Turkish President Recep Tayyip Erdogan a day earlier vowed to "destroy" the YPG and said Ankara was determined to push Kurdish fighters back from the border area. "We have completed our preparations, plans, programmes regarding this issue", he told members of his ruling Justice and Development Party in parliament.
Pentagon spokesman Cmdr. Sean Robertson told CNN on Tuesday that the USA was encouraging "all parties to avoid escalation and focus on the most important task of defeating ISIS", adding that "the campaign against ISIS is not over and the fight remains very hard".
The YPG, the dominant group and leader of the USA -allied Syrian Democratic Forces (SDF), controls almost all of the territory east of the Euphrates, including regions along Syria's border with Turkey.
American backing of the SDF has caused tensions with North Atlantic Treaty Organisation ally Turkey, which considers the YPG militia to be a terrorist organization tied to the Kurdistan Workers' Party (PKK) battling the Turkish army for almost four decades.
Last week, IS jihadists staged a counterattack following a weeks-long SDF offensive in the countryside around Hajin. It also envisions Kurdish YPG forces withdrawing from the town to the east of the Euphrates.
Training for the patrols was recently concluded and three USA defense officials told CNN on Tuesday that the joint patrols were due to begin in "a matter of days". Conducting joint patrols is seen as a way to tamp down potential violence between the various groups in the area. In an effort to alleviate the situation, the USA agreed to jointly control Manbij with Turkish forces, and Kurdish forces agreed to withdraw.
"We are aware of Turkish statements about a planned offensive into northeast Syria and have been in touch with Turkey and the SDF to de-escalate the situation", he added, while saying that the United States military was "working closely with the SDF who are in the midst of offensive operations against ISIS in the Middle Euphrates River Valley", calling the USA allies "a committed partner against ISIS".
Turkish forces this week struck several Kurdish militia targets near the town of Kobani in northern Syria. He was referring to a Kurdish enclave taken earlier this year by Turkish troops and Turkey-backed Syrian opposition fighters.
The Manbij deal focuses on the withdrawal of the PKK's Syrian offshoot, the YPG terrorist organization, from the district that is located west of the Euphrates river in order to establish stability in the region.
The YPG "should know it will be buried in the trenches it has dug", Akar said.