Colonization of eastern parts of russia involved forced conversion to christianity, violence, rape, mass murder, but not language extermination
Even culture extermination is an exaggeration, sure some areas got forcibly "converted" to christianity (if they were unlucky to be invaded before USSR) but you will see mosques/buddha statues/whatever is applicable and all the local traditions and beliefs mostly going like before
Actually in areas where local languages exist they kept schools teaching local languages and official signs are duplicated in both local and Russian all the way from USSR. I know this first hand;) but even the article you linked will tell you that.
So it was maybe not as good as support for indigenous languages in Canada but not extermination
Only since 2018 it is optional to teach local language in schools, previously there were at least some schools that teach it in every area like that. thank Putler for that too.