Turkey started joint patrols with Russia in northern Syria Friday to verify whether Kurdish forces have withdrawn from a key border zone in compliance with a deal reached between Ankara and Moscow.
The patrols, which began around 0900 GMT, follow an agreement they signed in the Black Sea resort of Sochi last week which gave Kurdish forces 150 hours to withdraw from a band of territory along Syria's border with Turkey, in a process that Russia said was now complete.
The patrols add to the complicated mix of forces operating along the frontier, including U.S. troops who patrolled an eastern section on Thursday for the first time since U.S. President Donald Trump said last month his country's troops were withdrawing.
The patrols on Friday began near the border town of Derbasiyeh -- from which Kurdish fighters have already pulled out -- and ended at 1315 GMT, an AFP correspondent on the Turkish side of the border reported.
The soldiers had headed to the east of Derbasiyeh in a convoy of Turkish and Russian military vehicles to patrol a strip of territory several dozen kilometers long, according to Turkish military sources.
The Russian army said in a statement that the convoy consisted of nine vehicles, protected by an armored personnel carrier, covering more than 110 kilometers (68 miles).
An AFP correspondent in Derbasiyeh said the vehicles did not fly Turkish or Russian flags, in line with a request by Moscow.
The Turkish defence ministry had earlier confirmed in a tweet that the patrols with ground and air units were "underway".
The ministry said in a separate tweet that a meeting with a Russian military delegation was planned in Ankara to discuss "tactical and technical issues".
Last week's Sochi agreement halted a Turkish operation launched against Kurdish forces in northeastern Syria on October 9, which left hundreds dead and prompted tens of thousands to flee their homes.
Under the deal, Turkey is to assume control over one 120 kilometer (75 mile) wide section in the center of the border, while Syrian government forces are to deploy to the east and west.
Along the whole length of the border, a 10-kilometer-deep buffer zone is to be created on the Syrian side which will be jointly patrolled by Russian and Turkish troops.
Turkey intends to set up a "safe zone" 30 kilometers deep, in which some of the 3.6 million Syrian refugees it is hosting could be resettled.
The Kurds spearheaded a U.S.-backed military campaign against the Islamic State group that deprived the jihadists' of their final sliver of Syrian territory in March this year but Ankara views the Kurdish forces as "terrorists".
Abandoned by their ally Washington -- which early last month pulled its own troops back from the border area, effectively allowing Turkey to attack -- the Kurds turned to Damascus which swiftly deployed its forces, reclaiming swathes of territory it lost as long ago as 2012.
President Bashar al-Assad said Thursday the Sochi agreement was "temporary," and will eventually pave the way for his government to retake Syria's northeast.
He said troop deployments were a prelude to reinstating central government control over the region in a process he said would be "gradual" and would "respect new realities on the ground".
Nearly 100 kilometers (around 60 miles) from the site of the joint patrols in Derbasiyeh, a convoy of five U.S. armored vehicles was seen patrolling on Thursday in a zone north of the town of Qahtaniyah.
The Britain-based Syrian Observatory for Human Rights said it was part of an eastern stretch of the border where US forces are seeking to maintain a presence.
"They want to prevent Russia and the regime from reaching parts of the border that lie east of the city of Qamishli," the de facto capital of Syria's Kurdish minority, Observatory head Rami Abdul Rahman said.
A spokesman for the U.S.-led coalition said its forces are transiting on routes near the border as Washington "withdraws troops from northern Syria and repositions some troops to the Deir Ezzor region," near the border with Iraq.
"All coalition military operations are de-conflicted with other forces operating in the region, through pre-existing channels," Colonel Myles B. Caggins told AFP.
Washington has begun reinforcing positions in Deir Ezzor province with extra military assets in coordination with the SDF to prevent the Islamic State group and others from gaining access to oil fields in the area, a US defence official has said.
Some 200 US troops are already stationed in Deir Ezzor.
Trump last month said a "small number" of US troops would stay to "secure the oil".
This article was written by Delil Souleiman with Mahmut Bozarslan in Kiziltepe from Agence France Presse and was legally licensed through the NewsCred publisher network. Please direct all licensing questions to firstname.lastname@example.org.