Edit: Mustafina left Alexandrov! Now there are news source about this whole drama. Basically as we all already knew that Alexandrov's contract as head coach expired on Dec 2012. It was not renewed leaving him out as the head coach. He was still allowed to be Aliya's personal coach but Aliya refused to have him as her personal coach. Alexandrov is now in America with his family.
Source 1 & Source 2