Could Putin become impeached?

At least on paper, the Russian Federation is a constitutional democracy with the legal possibility of impeaching the President. There were three attempts to remove Yeltsin from office and Wikipedia states that

President Putin is now also facing possible impeachment

https://en.wikipedia.org/wiki/Impeachment_in_Russia (current revisions)

Apart from this statement I have neither read anything about the chances of such a procedure to be initiated nor its predicted success.

Could the reason be that in today's Russia anyone who publicly pursues an impeachment procedure would face serious threats? Or would there simply never be a majority to make it succeed?