you wanna try slovenia kanin in bovec awsome off piste jumps rollers everywhere contact Snowboard ski and adventure sports holidays. Bin to borovets in bulgaria - tree lined slopes - a bit limited. Good for beginers.
I know some people who ride in Ukraine. I skied in the Carpathians (Ukraine part) when I was younger. Haven't been to Caucasus but the views are supposed to be incredible for hiking. Not as many people in Russia have the monetary means to go away on Ski/Snowboard trips.
most of the resorts in eastern europe are linited and fairly small
i was in bansko,bulgaria just after new year when it dumped it
good for a very cheap week away(£350 all in half board)but wouldnt want to spend more than a week there
slovakia seems the same