France's promise to back Syrian forces led by a Kurdish militia amounts to support for and legitimisation of terrorist groups, Turkish Deputy Prime Minister Bekir Bozdag said on Friday.

French President Emmanuel Macron on Thursday assured the Syrian Democratic Forces (SDF), dominated by the Kurdish YPG, of Paris' support to stabilise northeastern Syria against Islamic State

"Those who enter into cooperation and solidarity with terror groups against Turkey...will, like the terrorists, become a target of Turkey," Bozdag wrote on Twitter. "We hope France does not take such an irrational step."