U.S. military commanders are ‘pissed off’ about the mission creep in Syria

The U.S. has teams of special operations troops on the ground in Syria to support some Sunni Arab militias in fights against ISIS. Other Sunni Arab groups receive money and weapons from the U.S. In some situations, they fight alongside al Nusra militants against common enemies like ISIS.

That ambiguity will frustrate the Russians.

“The Russia would like to make it black and white, and say ‘U.S., you tell your guys to separate form Nusra.’ But I can’t see the U.S. being that black and white about it,” Lopour said.