So it's a bit of an odd question, but considering this isn't Earth, can I have larger than normal bears?

I was thinking of armoring them and training them and using them as tanks, considering my nation doesn't have much industrial technology. Considering this is a fantasy NRP, it would be interesting to have a biological alternative to mechanized warfare.

If not, I can go with elephants, since those actually exist. But I'm trying to be more stereotypically Russian.