This isn't Sanya, actually. The artist says it's an original character on his pixiv page. An Orussian witch with a wolverine familiar. Her striker units are based on the Lavochkin La-5. No name is given.
Also she doesn't have sanya's skirt, so I'm taking the cosplay tag out by the messages of the posters so far add it in again if it indeed is a cosplay of sanya