US patrols Syria border for first time since pull-back
Five armoured vehicles bearing US flags patrolled a strip of the frontier north of the town of Qahtaniyah, an area where regime forces were expected to deploy as part of a deal with Turkey, the correspondent said.
The patrol was accompanied by Kurdish fighters of the Syrian Democratic Forces, the main US ally in the years-long battle against the Islamic State group.
US forces used to patrol the section of border north of Qahtaniyah before Washington announced its pullback on 6 October.
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The Britain-based Syrian Observatory for Human Rights said it is part of an eastern stretch of the frontier 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.
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The patrol follows the arrival of US reinforcements in Syria from neighbouring Iraq in recent days, in what has been seen as a reversal of US President Donald Trump's pullout order.
Washington has begun reinforcing positions in Deir az-Zour province with extra military assets in coordination with the SDF to prevent the Islamic State group and other actors from gaining access to oil fields in the area, a US defence official has said.
The Turkish army and its Syrian proxies launched an offensive against Kurdish forces in northeastern Syria on 9 October with the aim of creating a buffer zone.
The invasion left hundreds dead and displaced tens of thousands, prompting Ankara and Moscow to hold a summit in Sochi.
Under the deal signed in the Russian Black Sea resort, Turkey is to assume control over one 120 kilometre (75 mile) wide section in the centre of the border, while Syrian regime forces are to deploy in sections to the east and west.
Along the whole length of the border, a 10-kilometre-deep buffer zone is to be created on the Syrian side which will be jointly patrolled by Russian and Turkish troops.
Turkey has warned it will directly attack and Kurdish fighters remaining in the border zone after the withdrawal deadline.