Türkiye is not satisfied with talks with the United States on establishing a "safe zone" in northern Syria and will act alone if there is no progress, Foreign Minister Mevlut Cavusoglu said on Friday.
Ankara has repeatedly threatened to act against the Syrian Kurdish YPG militia, which it deems a terrorist group, unless its NATO ally removes the fighters from a 480-km (300-mile) long area on the Syrian side of its border.
"We are not pleased with the current state of efforts and we have conveyed this to the Americans very clearly," Cavusoglu told reporters after the U.N. General Assembly in New York.
"If we cannot find a way with the United States, we will clear out the terrorist organisation," he told the briefing, broadcast live on Turkish television.
The two countries have started joint land and air patrols along part of Syria's border with Türkiye, but Ankara remains angry with Washington's support for the YPG, which has been a key ally in its fight against Islamic State in Syria.
Earlier on Friday, President Tayyip Erdogan was reported as saying that Türkiye's work on the safe zone was on schedule and its military preparations along the border were complete.
"Türkiye is not a country that can be stalled," broadcaster NTV cited him telling reporters as he returned from New York.
On the sidelines of the General Assembly, U.S. Special Envoy to Syria James Jeffrey told reporters that Washington was moving as fast as possible, but added:
"We've made it clear to Türkiye at every level that any unilateral operation is not going to lead to an improvement in anyone's security ... The Turks have an option, of course, to act militarily."