"We welcome those statements from the foreign ministry," State Department deputy spokeswoman Marie Harf told reporters, after Ankara said it was now helping Iraqi peshmerga fighters to reach the Syrian Kurdish town of Kobane under attack from Islamic militants.
An influx of well-trained peshmerga fighters into Kobane could be a major boost for the Syrian Kurds, who are now being supported by US-led air strikes and air drops after a month-long battle against the Islamic State (IS) group.
"I think as we've all seen ISIL pour more resources, more fighters into Kobane, the situation has become... Increasingly serious," Harf said.
She added talks were continuing with Turkey about further ways in which the Turks could help the US-led coalition fighting the militants, who have grabbed a large area of territory in Iraq and Syria.
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"I would disagree with the notion that there's some split between us on how to fight this threat. Overarching goals here are exactly the same. We have constant conversations about tactics and strategy and how we should go about that."
"And our support will continue to help them repel ISIL. That said, there's still a possibility that Kobane will fall," she warned.
US Secretary of State John Kerry warned today during a visit to Indonesia that it would have been "irresponsible as well as morally very difficult" to turn the world's back on Kobane.