The relocation of Turkish troops to an area near the border with Syria comes a day after US troops were seen patrolling the tense border in Syria.
Ankara is gravely concerned by photos of US soldiers attending the funerals of Syrian Kurdish People's Protection Units (YPG) militants, who it says are linked to the outlawed Kurdistan Workers' Party (PKK), in the wake of Turkish air strikes on the two groups, President Recep Tayyip Erdoğan has said.
The Defense Department would not confirm to the Times whether the troop presence was meant to deter fighting between Turkish forces and the Kurdish militant group the People's Protection Unit. The Pentagon said last week that USA forces operate "in close proximity with" SDF fighters in northern Syria, including near the Turkish border.
Turkey views the YPG as a terrorist organization and an extension of the Kurdish militants who have been waging a three-decade-long insurgency.
Speaking from Baghdad, Col. John Dorrian, a spokesman for Operation Inherent Resolve, said the Turkish airstrikes in Syria and Iraq were conducted without the proper coordination with the coalition operating in Iraq and Syria.
The U.S.'s support of the Kurds in Syria has enraged Recep Tayyip Erdogan, the President of Turkey.
On 28 April, US troops visited the border areas between Rojava and Turkey to inspect the Kurdish areas bombed by the Turkish Army. "We are doing what is necessary", Erdogan said in Istanbul.
"It will also bother us as two North Atlantic Treaty Organisation countries and strategic partners", he said. Ankara said Washington and Moscow had been properly informed in advance. However, pictures online appear to show USA armored vehicles displaying the American flag - a tactic used by the Rangers in Manbij to highlight American forces' visible presence in the region. Syrian government forces backed by Russian Federation also operate in the area. Instead of working with the Syrian Kurds, Turkey is pressing the United States to let its army join the campaign for Raqqa, the self-proclaimed capital of the Islamic State. "We are seriously concerned to see USA flags in a convoy that has YPG rags on it".
President Tayyip Erdogan said on Friday Turkey's southern border region with Syria had come under serious mortar fire over the last two days and Turkish forces were retaliating as necessary. Erdogan complained at a conference in Istanbul, that United States support for YPG fighters within Syria was damaging solidarity between the USA and Turkey.
Mr Erdogan said the sight of American flags in the convoy alongside YPG insignia had "seriously saddened" Turkey.
Confirming that the proxy war in Syria is becoming ever less so, the USA has recently shifted from working quietly behind the scenes in Syria's conflict toward overt displays of US force in an attempt to shape the fight.
"We hope that this military mobilisation is not meant to provoke our forces or for another objective linked to entering Syrian territories". In a statement, the SDF said it had captured six more neighborhoods in addition to the radio station building from ISIS in the city of Tabqa, west of Raqqa.