Hi.
AFAIK "Baltic Birch" is only a trade name for some company, I don't even know which.
Not all the plywood, or birch plywood for that matter, that comes from the Baltic countries is all that good.
Now the Russian plywood, all that I can say about the samples I've seen/used/burned is that it looks and smells pretty much like something out of a landfill (hide based glues have that effect on ya).
I'm fortunate enough to live in a country that makes high enough quality plywood for a hobbyist like me

.
The bottom line for me: Don't buy hype, buy quality.
Regards
Sam