The game is in the “Play by forum” forum, look at it yourself; it seems like it worked, because Zero conceded within a turn from that move, stating that the pressure on Germany was too great and his offensive movement would not have been enough to compensate for it.
I had actually planned on evacuating Karelia on my next Russian turn so as to move offensively with Russia against Eastern Europe as well, as long as I had enough to defend Moscow. Germany would have easily conquered Karelia but it wouldn’t have done them any good having a northern factory when they would need to spend all their income defending their capital.