The United States will withdraw all of its troops from Syria, a US official said on Wednesday, after President Donald Trump said America has "defeated ISIS" in the war-ravaged country.
The stunning move will have extraordinary geopolitical ramifications — and plunges into uncertainty the fate of US-backed Kurdish fighters who have been tackling Islamic State militants.
"We have defeated ISIS in Syria, my only reason for being there during the Trump Presidency," the Republican leader tweeted.
The US official said that Trump's decision was finalised on Tuesday.
"Full withdrawal, all means all," the official said when asked if the troops would be pulled from across all of Syria.
Currently, about 2,000 US forces are in Syria, most of them on a train-and-advise mission to support local forces fighting IS.
Most US troops are stationed in northern Syria, though a small contingent is based at a garrison in Al-Tanaf, near the Jordanian and Iraqi borders.
Trump had previously voiced scepticism about the US presence in Syria, saying in March he wanted to bring troops home "soon."
But the president's military advisers and international allies warned him against a precipitous pullout and the mission continued.
The US official would not provide a timeline, saying only: "We will ensure force protection is adequately maintained, but as quickly as possible."
Echoing Trump, White House spokeswoman Sarah Sanders said IS has been defeated territorially, but that the US-led coalition that includes dozens of nations would continue fighting the militants.
"These victories over ISIS in Syria do not signal the end of the Global Coalition or its campaign," Sanders said in a statement.
"We have started returning United States troops home as we transition to the next phase of this campaign."
A Pentagon spokeswoman said the department had "started the process" of pulling troops out.
It was not immediately known what effect the troop withdrawal would have on air operations in Syria.
These have been ongoing since late 2014.
A large contingent of the main US-backed, anti-IS fighting force in Syria, an alliance known as the Syrian Democratic forces (SDF), is Kurdish and is viewed by Turkey as a "terrorist" group.
Ankara has said it plans to launch an operation against the Kurdish militia, known as the YPG (Kurdish People's Protection Units).
While the YPG has spearheaded Washington's fight against IS, US support has strained relations between the Nato allies.
Ties have grown even more fraught since the US set up observation posts in northern Syria close to the border with Turkey to prevent any altercation between Ankara's forces and the YPG.
In a sign of possible rapprochement, however, the State Department said yesterday it had approved the $3.5bn sale of Patriot missiles and associated equipment to Turkey.
The decision to withdraw marks a remarkable development not just for Kurds in Syria, but for long-established US doctrine in the region.
Only last week, Brett McGurk, the special envoy to defeat IS, said "nobody is declaring a mission accomplished."
"If we've learned one thing over the years, enduring defeat of a group like (IS) means you can't just defeat their physical space and then leave," he said.
The US-led coalition on Friday had said the mission was unchanged and any reports to the contrary were "false and designed to sow confusion and chaos."
A US presence in Syria is seen as key to pushing against Russian and Iranian influence in the country and across the broader region.
Tehran-backed militias have supported the regime of Syrian President Bashar al-Assad, and Moscow in 2015 intervened in the conflict to prop him up.
Republican Senator Lindsey Graham, a Trump ally, said the president's decision was unwise.
"President @realDonaldTrump is right to want to contain Iranian expansion," Graham said on Twitter.
"However, withdrawal of our forces in Syria mightily undercuts that effort and put our allies, the Kurds at risk."
Charles Lister, a senior fellow at the Middle East Institute, called the decision "extraordinarily short-sighted and naive."
"This move will look like a 'withdrawal,' not a 'victory,' and yet more evidence of the dangerous unpredictability of the US president," Lister said.
"This is not just a dream scenario for ISIS, but also for Russia, Iran and the Assad regime, all of whom stand to benefit substantially from a US withdrawal."
IS swept across large swaths of Syria and neighboring Iraq in 2014, implementing their brutal interpretation of Islamic law in areas they controlled.
But they have since seen their dream of a state crumble, as they have lost most of that territory to various offensives.
In Syria, IS fighters are holding out in what remains of the pocket that once included Hajin, including the villages of Al-Shaafa and Sousa.
Republican Congressman Adam Kinzinger, a former pilot in Iraq and Afghanistan, blasted Trump's decision.
"Really? Iran is rejoicing right now. We left Iraq, and had to come back. I would sure hope the president and his advisers are smarter than this," he said on Twitter.
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