'Playing with fire'

Turkey and Russia oppose US-led border security force in Syria

The US have begun training a border force of 30,000 Syrians - mostly Kurds - to protect the borders of rebel held territory in predominately Kurdish areas of northern Syria. The problem is the main border they will be stationed along is the Turkish border and Turkey and the Kurds are kind of enemies. So now they have warned their ally the US to back off saying they are "playing with fire" by training up "terrorists" along their borders and threatened to wipe out the Kurds in Syria. 

Oh and Russia are kind of upset too. You can read why here if you're interested.