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Two British special forces soldiers injured by Isis in Syria

US army vehicles supporting the Syrian Democratic Forces in Hajin eastern Syria. AFP

And it would be carried out in such a way as to "make sure that the defence of Israel and our other friends in the region is absolutely assured, and to take care of those who have fought with us against ISIS and other terrorist groups", he said.

According to Bolton, US President Donald Trump told him that he would "not allow Turkey to kill the Kurds".

Kurdish forces based in the north of Syria fought alongside the United States against the so-called Islamic State, but fear attack from Turkey after Washington announced it would be pulling out its forces from the region.

On December 19, the U.S. President Donald Trump stated the U.S. forces are to leave Syria.

Bolton's comments mark the first public confirmation that the withdrawal has been slowed.

Although Trump vowed to bring USA troops home as soon as possible, bitter disagreements between Washington and Ankara over the status of the Kurdish militias will likely bring the withdrawal to a halt.

Bolton said the US has asked the Kurds to "stand fast now" and refrain from seeking protection from Russian Federation or Syrian President Bashar al-Assad's government.

Joost Hiltermann, Middle East and North Africa Program Director for the International Crisis Group, said the latest U.S. move showed a lack of "coherent policy" on the Middle East.

What is the U.S. presence in Syria?

Two British special forces soldiers have been seriously injured in a missile attack by the Islamic State (Isis) in Syria.

He has essentially carried on with President Obama's policy in Syria, launched in 2014, when ISIS was at its peak, and defined by an aggressive bombing campaign and a small number of US forces who work with the Kurds and other USA partners.

Kurdish forces are fighting against so-called Islamic State in Syria, with the Kurdish north-east of the country seeking autonomy.

The White House's top national security official is expected to travel to Turkey on Monday, where he is supposed to discuss Ankara's plans to fight Daesh.

Bolton said the USA has told its Kurdish allies to "stand fast now" and refrain from seeking protection from Russian Federation or Syrian President Bashar al-Assad's government. "That a terror organization can not be allied with the self-evident", he said. While the US has relied on Kurdish forces, known as the YPG, in the fight against ISIS, Turkey considers the group an offshoot of the Kurdistan Workers' Party, or PKK.

Turkey will resolutely continue its efforts to end the bloody civil war in Syria and provide security to Syrians regardless of their religion and ethnicity, the presidential spokesperson added. He defended the legal basis for the deployment, saying it's justified by the president's constitutional authority.

Bolton on Sunday also toured the ancient tunnels beneath the Western Wall in Jerusalem's Old City.

Israel annexed East Jerusalem after capturing it from Jordan in the 1967 Six Day War, a move not recognized by most of the global community.