"If the operation became more than fighting a potential terrorist threat on the Turkish border and turns out to be an invasion operation, we would have a real problem with that," Macron told Le Figaro daily.

The U.S. and France have repeatedly expressed concern over Turkey's 12-day cross-border offensive against the Kurdish People's Protection Units (YPG), which Turkish President Recep Tayyip Erdogan last week threatened to expand.

On Tuesday, French Foreign Minister Jean-Yves Le Drian said that if the operation turned into an "occupation" of parts of Syria, it would be "totally reprehensible".

According to AFP his remarks came after Erdogan threatened to push further east along the Syrian-Turkish border, until there was "no terrorist on our border leading to Iraq".

Macron said Turkey's operation required Europe and its allies to "have discussions and take decisions", without specifying what they might be.

Reporter’s code: 50101