Turkish President Recep Tayyip Erdogan has lashed out at the US over its support for Syria’s main Kurdish group.
He accused Washington of creating a “sea of blood” by failing to recognise as terrorists members of the Democratic Union Party (PYD) and its armed wing.
The PYD, which the US is relying on to battle so-called Islamic State inside Syria, is an offshoot of the PKK.
Mr Erdogan’s comments come as he faces pressure to allow in 30,000 Syrians stranded on the border with Turkey.
The refugees have fled an offensive by Syrian government forces and allied militias on rebel-held areas around the northern city of Aleppo.
France’s outgoing foreign minister, Laurent Fabius, also criticised US policy in Syria on Wednesday, saying that its ambiguity had contributed to the failure to end the conflict.
“We don’t have the feeling that there is a very strong commitment,” he said.