I don’t know who did this but it needs to be fixed ASAP. Kerning is awful, x-height is awful, no small caps are present (check  below for correct small caps), it almost seems like designers didn’t check their fonts at all.
- https://ru.m.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-ru.svg − ugly version
- https://commons.wikimedia.org/wiki/File:Википедия_(Wikipedia)_in_Russian_in_Linux_Libertine.svg − good version
- https://en.m.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg − no issues either
Seems to be related to this: T148514.