1) Ok, there is contradictory information, I'll leave only a quote from the aforementioned wikipedia article:
At this time the Soviet Union established a Communist puppet government for Finland, and intended to conquer all of Finland according to some sources.[29][30][31] Other sources argue that there is no documentary evidence to support this and that there are arguments against the idea of a full Soviet conquest.[32][33]
(there are prooflinks, if you want).
2) Agreed, a Pyrrhic victory is still a victory.

Sill, I don't care. My point was that even though Russian Federation armed forces seem to be strong and powerful there's no guarantee that a military attack on Ukraine wouldn't turn out to be a disaster (even from a pure military standpoint).