Washington's decision to pull out 2,000 of his ground forces from Syria has stunned most allies including France but was greeted with approval by Turkey, which will now have a freer rein to target Kurdish fighters from the US-backed People's Protection Units (YPG).

"If France is staying to contribute to Syria's future, great, but if they are doing this to protect the (militia), this will bring no benefit to anyone," Mevlut Cavusoglu said, according to Hurriyet daily, in comments also partially carried by the state news agency Anadolu.

Turkey views the YPG militia as a sister "terrorist" organisation of the outlawed Kurdistan Workers' Party (PKK), which has waged an insurgency inside Turkey since 1984. The PKK is blacklisted as a terror group by Ankara, the US and the European Union.

US President Donald Trump last week ordered the withdrawal of US ground forces that had been in Syria to provide training to the YPG under the Kurdish-led Syrian Democratic Forces (SDF) alliance battling against the Islamic State (IS) group.

The shock move put allies on the backfoot, with French President Emmanuel Macron on Sunday saying "an ally must be reliable".

In a sign of the growing diplomatic rift between the two leaders, Macron said "I deeply regret the decision" by Trump to pull out US troops.

Cavusoglu hit out at France's "support" of the YPG, which he said was "no secret" as he slammed French officials' meetings with leaders of the SDF's political wing last week.

Turkish President Recep Tayyip Erdogan has said Turkey will intervene in the coming months against IS and the YPG.

Cavusoglu said Turkey has "the power to neutralise (IS) alone" amid fears that a US pull-out will hurt the fight against IS.

Critics say thousands of IS members are still in Syria and could pose a threat with some analysts concerned the withdrawal could lead to a resurgence of IS.