>> The relationship between the United States and it's NATO ally Turkey, may be stretching beyond repair. And Washington's backing of what they call a border force of fighters in Syria and Iraq along Turkey's Southern frontier, is providing another strain. It's planned to be 30,000 strong and will protect territories seized by Kurdish forces in Syria.
Now Turkish President Tayyip Erdogan says he's going to, quote, strangle it before it's even born.>> Country that we call our ally insists on forming a terror army along our border despite all our objections, warnings, and well meant advice. Do you think a terrorist organization formed along the Turkish border has a target other than Turkey?
>> Washington's support of the Kurds has been a major point of conflict with Turkey since the intervention began in 2014. They're the backbone of US efforts there, but viewed by Erdogan as closely tied to Kurdish separatists within his own borders. And Russia, which has grown closer to Turkey while still backing the opposite side in the civil war, has called the border force plans a plot to dismember Syria and place part of it under American control.
Washington says it intends to use the border force as a peacekeeping mechanism to keep Islamic State's remnants from returning to the area. But Turkish backed fighters have been known to clash with the Kurdish forces. Americans' support of the Kurds, including embedding US forces among its fighters, has only enraged Erdogan's government further.
Syria's president Bashar al-Assad said his troops will crush the border force and drive it from the country.