Is Donald Trump 'playing with fire' by backing Kurds in Syria?

US support for Kurds in Syria is leading to threats of retaliation from Turkey. A coalition of countries led by the US is planning a thirty thousand-strong force in Syria, just across the border with Turkey.

Turkey's President thinks the Kurdish-led force is a threat and is vowing to attack the city of Afrin in northern Syria.

Afrin is a a major stronghold of YPG Kurdish fighters. Turkey considers the YPG a terrorist group linked to the Kurdistan Workers' Party. Its PKK fighters have waged a long war against Turkish dominance.

How much volatility will be added to the war zone?