This photo shows the US and Turkish forces make move to the Syria-Turkey border area. File photo

Defence Secretary Mark Esper says that under current plans all US troops leaving Syria will go to western Iraq and the military will continue to conduct operations against the Daesh group to prevent its resurgence.

Speaking to reporters travelling with him to the Middle East, Esper did not rule out the idea that US forces would conduct counterterrorism missions from Iraq into Syria. But he said those details will be worked out over time.

His comments were the first to specifically lay out where American troops will go as they leave Syria and what the counter-Daesh fight could look like. Esper said he has spoken to his Iraqi counterpart about the plan to shift the more than 700 troops leaving Syria into western Iraq.

The developments made clear that one of President Donald Trump's rationales for withdrawing troops from Syria was not going to come to pass any time soon. "It's time to bring our soldiers back home," he said Wednesday. But they are not coming home.

As Esper left Washington on Saturday, US troops were continuing to pull out of northern Syria after Turkey's invasion into the border region. Reports of sporadic clashes continued between Turkish-backed fighters and the US-allied Syria Kurdish forces despite a five-day cease-fire agreement hammered out on Friday between US and Turkish leaders.

Trump ordered the bulk of the approximately 1,000 US troops in Syria to withdraw after Turkish President Recep Tayyip Erdogan made it clear in a phone call that his forces were about to invade Syria to push back Kurdish forces that Turkey considers terrorists.

The pullout largely abandons the Kurdish allies who have fought the Daesh group alongside US troops for several years. Between 200 and 300 US troops will remain at the southern Syrian outpost of Al Tanf.

Esper said the troops going into Iraq will have two missions.

"One is to help defend Iraq and two is to perform a counter-ISIS mission as we sort through the next steps," he said. "Things could change between now and whenever we complete the withdrawal, but that's the game plan right now."

The US currently has more than 5,000 American forces in Iraq, under an agreement between the two countries. The US pulled its troops out of Iraq in 2011 when combat operations there ended, but they went back in after the Daesh group began to take over large swaths of the country in 2014. The number of American forces in Iraq has remained small due to political sensitivities in the country, after years of what some Iraqis consider US occupation during the war that began in 2003.

Associated Press