For Russian/CIS users, Bucharest is the sweet spot: 45-60ms RTT from Moscow (better than Iceland or Helsinki for many routes), EU-grade infrastructure stability, and a jurisdiction that doesn't cooperate with Roskomnadzor takedown campaigns.
For bridge operators specifically: Roskomnadzor cannot compel Romanian providers to remove bridges from the Tor directory or block them at the ISP level. Russian users connecting to a Bucharest bridge experience lower latency than to Western EU bridges, meaning better Tor performance for heavy users.