"In the wake of the unsuccessful Bolton's visit to Ankara, Turkish-American relations are probably headed toward another impasse," said Faruk Logoglu, a former Turkish senior diplomat.

"Whether the two allies will be able to avoid a new crisis will depend largely on the next matching moves by Erdogan and Trump in Syria," he told Xinhua.

In an apparent response to Erdogan's criticism of Washington's attitude, U.S. Secretary of State Mike Pompeo stated that the U.S. stance would not change.

"It's important that we do everything we can to make sure that those folks that fought with us are protected and Erdogan has made commitments," Pompeo said.

Washington has used the Kurdish militia, known as the People's Protection Units, as a ground force against the Islamic State militants in Syria.

"If the operation is undertaken before the U.S. withdrawal, a confrontation between Turkish and American troops could deal a severe blow to bilateral ties," cautioned Logoglu.

Turkey would not risk raising tension with the Uited States at a time when its ailing economy is in great need of foreign capital, Uzgel said.

U.S. sanctions on Iran may also emerge as a major area of confrontation between the NATO allies in the coming months, as Ankara has repeatedly said it would not comply with the U.S. anti-Iran moves.

"A lack of agreement on Syria could also affect the position of the two countries regarding Iran," added Logoglu.

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