American troops ‘will no longer be in the immediate area’ casting uncertainty on the fate of their Kurdish allies.

US troops began withdrawing from northeast Syria ahead of a Turkish invasion that Kurdish fighters say will overturn the victory over the Islamic State of Iraq and the Levant (ISIL or ISIS) armed group.

Washington’s forces “will not support or be involved in the [Turkish] operation” and “will no longer be in the immediate area”, White House Press Secretary Stephanie Grisham said in a statement.

It was not clear whether that meant the United States would withdraw its 1,000 or so troops completely from northern Syria.

“Turkey will soon be moving forward with its long-planned operation into northern Syria,” said the statement.

A US official told Reuters news agency US forces had on Monday evacuated two observation posts at Tel Abyad and Ras al Ain in northeast Syria, along the Turkish border. Other US troops in the region were still in position for now, the official said.

The withdrawal marks a major shift in US policy and effectively abandons a US ally in the battle against ISIL, which took over swathes of Syria before being defeated earlier this year.

US President Donald Trump on Monday defended the decision to withdraw US troops from northern Syria, saying it was too costly to keep supporting its allies.

“The Kurds fought with us but were paid massive amounts of money and equipment to do so. They have been fighting Turkey for decades,” Trump said in a series of tweets. “Turkey, Europe, Syria, Iran, Iraq, Russia and the Kurds will now have to figure the situation out.”

….almost 3 years, but it is time for us to get out of these ridiculous Endless Wars, many of them tribal, and bring our soldiers home. WE WILL FIGHT WHERE IT IS TO OUR BENEFIT, AND ONLY FIGHT TO WIN. Turkey, Europe, Syria, Iran, Iraq, Russia and the Kurds will now have to….. — Donald J. Trump (@realDonaldTrump) October 7, 2019

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Turkish President Recep Tayyip Erdogan said on Monday his army was ready to launch operations against Kurdish fighters in Syria at any moment following the US announcement.

“There is a phrase that we always say: we can come any night without warning,” Erdogan told reporters in televised remarks. “It is absolutely out of the question for us to further tolerate the threats from these terrorist groups.”

Syria’s Kurds warned on Monday a Turkish military invasion would spark a major ISIL resurgence and vowed to battle Turkey’s military.

Such an operation would reverse years of successful Kurdish-led operations to defeat the armed group and allow some of its surviving leaders to come out of hiding, the Syrian Democratic Forces (SDF) said in a statement.

The Kurdish-led force also denounced Washington for the pullout.

“There were assurances from the United States of America that it would not allow any Turkish military operations against the region,” SDF spokesman Kino Gabriel said in an interview with al-Hadath TV.

“But the [US] statement today was a surprise and we can say that it is a stab in the back for the SDF.”

The Syrian-Kurdish force said in a statement it has lost 11,000 fighters in the war against ISIL.

‘Great cost’

Turkish Foreign Minister Mevlut Cavusoglu said on Monday that Turkey would “clean up terrorists” in Syria.

“We are determined to ensure our country’s existence and security by clearing terrorists from this region,” Cavusoglu wrote on Twitter.

“From the start of the Syria war, we have supported that country’s territorial integrity and will continue to do so from now on. We will contribute to bring serenity, peace and stability to Syria.”

The UN, meanwhile, said it was “preparing for the worst” in northeast Syria.

“We don’t know what is going to happen,” the UN’s humanitarian coordinator for Syria, Panos Moumtzis, said in Geneva, stressing there were “a lot of unanswered questions” about the consequences of the operation.

Grisham, the White House press secretary, said following a call between Trump and Erdogan, Turkey is to take custody of foreign fighters captured in the US-led campaign against ISIL, who have been held by Kurdish forces supported by the US.

“The United States will not hold them for what could be many years and great cost to the United States taxpayer,” the statement said.

France, Germany, and other European nations have refused US requests to take back nationals who fought for ISIL.

Turkey previously warned it would carry out military operations east of the Euphrates River, but put its plans on hold after agreeing with the US to create a “safe zone” inside Syria’s northeastern border with Turkey, which would be cleared of the Kurdish People’s Protection Units (YPG) armed group.

Kurdish forces bore the brunt of the ground campaign against ISIL but are considered “terrorists” by the Turkish government.

The White House statement was silent on what would happen to the Kurds.

Turkey is highly likely to wait until US soldiers have withdrawn from the area before launching an offensive, a senior Turkish official told Reuters.

He said the withdrawal of US troops from the planned area of operations could take one week and Ankara was highly likely to wait for this in order to avoid “any accident”.

Syrian refugees

Ibrahim Kalin, Turkey’s presidential spokesman, said on Monday the safe zone in northern Syria had two aims: to clear “terrorist elements” from the border and to return refugees safely to Syria.

Kalin said Turkey was not after territorial gain in any country.

“Turkey is powerful and determined,” he said, adding it will not allow ISIL to return “in any shape and form”.

Turkey is home to 3.6 million Syrian refugees. Their presence has become a political issue as the country’s economy struggles to emerge from recession.

After eight years of war in neighbouring Syria, Ankara and NATO ally Washington agreed to establish a zone along 480km (300 miles) of the border that Turkey wants to be 30km deep (19 miles).

Under the Turkish plan, up to two million Syrian refugees would be settled in the area that would be cleared of the YPG.

Turkey views the YPG as an extension of the Kurdistan Workers’ Party, or PKK, which has waged an insurgency against Turkey for 35 years. An estimated 40,000 people have been killed.

Ankara and Washington consider the PKK a “terrorist” group but they diverge on the issue of the YPG, which forms the core of US-backed Syrian forces against ISIL.

‘Fill the vacuum’

Russia said on Monday that Syria’s territorial integrity must be preserved. “We hope that our Turkish colleagues would stick to this position in all situations,” Kremlin spokesman Dmitry Peskov said.

Peskov reiterated Moscow’s stance that all foreign military forces “with illegal presence” should leave Syria.

Since agreeing to set up the zone in northern Syria, Turkey has repeatedly warned of unilateral military action if efforts do not meet its expectations, saying it would not tolerate any attempts by the US to stall the process.

The ties between the allies have also been pressured over Turkey’s purchase of Russian S-400 defence missiles and the trial of local US consulate employees in Turkey.

Marwan Kabalan, from the Doha Institute of Graduate Studies, said Trump is desperate to secure any foreign policy success after failing on Afghanistan and Iran, and with fading progress on North Korea.

“In order to pullout from Syria someone else must come in and fill the vacuum there so Turkey might be that party to do that mission. We have to look at the domestic needs of President Trump on one hand, and also the pressure the Turks are putting on the Trump administration,” Kabalan told Al Jazeera.

He said the US’ handling of Iran after the attacks on Saudi Arabia’s oil infrastructure has changed perceptions about US military power in the Middle East.

“Everybody is seeing the United States in a weak position right now since they were not willing to start any confrontation in the region,” Kabalan added.