Seth Dickinson, a science fiction author to watch, has written an impressive story about alien contact, terrible choices, and genocide in "Anna Saves Them All," by Seth Dickinson. This short story appears in tne September 2014 issue of Shimmer.
Anna is Yazidi who remembers the cruelty of the "man in the red beret." She also knows that Ssrin sees some of that ruthlessness in her.
This author has also written "Morrigan in the Sunglare" for Clarkesworld and "A Tank Only Fears Four Things" for Lightspeed.