Kurdish-led military force backed by Washington and now approved by Damascus is closing in on Islamic State's stronghold of Raqqa after taking the strategic Tabqa dam nearby.
During a visit to Montenegro on Wednesday, Turkish foreign minister Mevlut Cavusoglu said there was no difference between the Syrian Kurdish fighters and the outlawed Kurdish rebels fighting Turkey. But Ankara regards the group as a terror outfit, as it does the Syrian branch of the Kurdistan Workers' Party, who have waged an insurgency since 1984 inside Turkey that has left tens of thousands dead.
The Pentagon said on Tuesday it was aware of concerns in Turkey, which has given vital support to a US -led campaign against Islamic State insurgents in Syria and Iraq.
On April 30, USA forces accompanied by Kurdish People's Protection Units (YPG) began patrols along the Turkey-Syria border, acting as a buffer after Turkish airstrikes in the area killed 20 Kurdish fighters.
"We agree 100 percent with Turkey's concern about PKK ... and we support Turkey in its fight against PKK as a fellow North Atlantic Treaty Organisation member", Mattis said.
The issue risks stoking tensions between the two countries less than week before US President Donald Trump and his Turkish counterpart Recep Tayyip Erdogan meet for the first time as heads of state.
The U.S. said it would provide arms to the Kurdish-led Syrian Democratic Forces to help them drive Islamic State militants from the extremists' de facto capital, Raqqa.
He added that the London conference will review that work and take measures for further peace and development. "I hope they turn back from this mistake", Canikli said.
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De Mistura spoke ahead of a planned resumption of United Nations -mediated talks between the Syrian government and opposition next week in Geneva.
"The supply of arms will accelerate Daesh defeat and facilitate recapturing of Raqqa". Its leaders have railed against any strategy that, in their view, would involve the US using one terrorist group to fight another.
Mr Erdogan has not yet responded to Mr Trump's decision, but has repeatedly castigated Washington for its support of the YPG. The weapons will include machine guns, ammunition and mortars.
John Dorrian - the spokesman for the US-led coalition against ISIS called Operation Inherent Resolve - earlier tweeted that nearly all of the city has been seized and that fighters were clearing two neighborhoods.
"We are keenly aware of the security concerns of our coalition partner Turkey", she said.
The spokesman for the USA -led coalition against the Islamic State, Col. John Dorrian, told reporters Wednesday at the Pentagon that the weapons would be delivered to the Kurds soon.
Since then, Turkey is believed to have positioned more than 5,000 troops in northern Syria, and has escalated its airstrikes and cross border artillery attacks against the Kurdish forces.