The US-led coalition in Syria acknowledged over the weekend that it’s training a Kurdish-dominated “Border Security Force” to operate in northern and eastern parts of Syria.

The move has enraged Russia, Turkey, Iran, and the Syrian regime.

It has especially angered Ankara, which views Kurdish YPG as a terrorist organization — an extension of the Kurdish PKK that has waged an insurgency in Turkey for decades.

Business Insider asked the Pentagon and Operation Inherent Resolve on Tuesday and Wednesday why such a force was created, but both spokespersons were unable to give an answer until Wednesday night.