See here. I was not convinced by the recent attempt to dismiss the evidence shown in these graphs:
On the other hand, I know nothing about Russian elections and so others can feel free to clarify.
P.S. Although I know nothing about Russian elections, I think it makes sense for me to post on this because my real topic here is the evaluation of statistical claims. I’m not saying that the graphs convince me there was fraud, what I’m saying is that I was not convinced by the attempt to debunk the accusations of fraud.