I had to look it up to see if it's the same Andrei Nazarov that once played in the NHL back in the 90s. It is. All I can say is that this guy is as unstable as they come. He was that way as an NHL goon, and he's continued to be that way as a coach. He's even attacked fans at a KHL game with a stick. Not surprised he's a Putin fan and would not put it past him to fabricate such a story against an outspoken political rival. Straight out of the KGB playbook.
Even if it was true:
1. It was 10 years ago.
2. It was before Panarin even played in the NHL.
3. He was never tried or convicted for it.
4. It was a Latvian woman, which is basically the same as a man anyway.