Katelina found Kai in the dining room, hunched over a pink laptop, watching a video. Two girls stood behind him, whispering and giggling. Katelina assumed they were the device's owners.

The video clip showed photographs of a snowy scene. "-but Russian law enforcement claims that no such incident occurred." A mustached man in a heavy coat and a hat appeared, standing on stone steps in the snow. A voice translated over the top of him, "If fifty people had been butchered in their ...