Ironically at Worlds TAT said the korean federation is moving their skaters to Russia working with russian coaches and choreographer, but i don't know who she was referring:
I know Rebeka Kim and Kiril Minov are training in Moscow.
Aren't they both Russian born? BESP mentioned that at one point.
I haven't heard about anyone else training in Russia but a lot younger skaters go abroad for the facilities. Yuna herself went to St. Petersberg(?) at one point just for some ice time.