They gave no details but said Turkey's security concerns regarding the region would be addressed.
Heras said the goal for the USA was to prevent the destruction of the Syrian Democratic Forces, of which the YPG is the leading force, to ensure it remains the dominant player in northern and eastern Syria.
The operation will be carried out in the east of the Euphrates River in northern Syria as soon as possible to the area controlled by the YPG, the Turkish leader said on August 4.
Those Kurdish soldiers served as de facto US ground forces in Syria in the fight against ISIS, but some members have ties to a Kurdish group across the border in Turkey known as the Kurdistan Workers' Party or PKK - an organization the USA and Turkey consider a terrorist group.
American troops are stationed in northeast Syria, along with the Kurdish forces, and have fought the Islamic State group together.
On June 4, 2018, Turkish Foreign Minister Mevlut Cavusoglu and US Secretary of State Mike Pompeo discussed a roadmap on Syria's Manbij during talks in Washington.
Cavusoglu compared the negotiations to an earlier agreement with Washington meant to remove Kurdish YPG militia fighters from the northern Syrian city of Manbij.
The U.S. had proposed a two-tier zone 14 kilometers (8.7 miles) deep, less than half the size Turkey had wanted. It offered few other details.
The deal was reached days after Turkish President Recep Tayyip Erdogan warned that the Turkish military was about to launch an assault on USA -backed Kurdish forces in Syria, who were integral to the battlefield success against the terror group.
Damascus said the planned buffer zone further east serves "Turkey s expansionist ambitions", accusing both Ankara and Washington of violating its sovereignty.
"Humanitarian actors are increasingly concerned by statements suggesting possible military intervention, which would have severe humanitarian consequences in an area which has already witnessed years of military activity, displacement, droughts and floods", he added.
Turkish troops also man observation points that ring the last opposition stronghold in the north west - posts that are meant to uphold a now fraying ceasefire.
"We can describe yesterday's agreement a very good start", Cavusoglu said at a press conference on Thursday on the sidelines of the 11th Ambassadors' Conference in Turkey's capital Ankara. The administration also cut all funding for those projects and asked partner countries to step in instead, raising $325 million, but leaving their future in jeopardy, too.
If Turkey builds up its military presence in the east of Euphrates, the safe zone will provide the country to secure a strip of land stretching more than 400 km along Syria's northeastern border with Turkey, what Ankara identifies as "peace corridor".
Syrian government forces have maintained an intense air campaign that has enabled their troops to advance in recent days.
Jia Kurd and a second top Kurdish politician said the fruits of U.S.
The capture of al-Sakhr in northern Hama province followed the capture of two villages on Wednesday.
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