In USSR and in the eastern blockthere were several singers wich performed greek songs (composed in greece) and songs from their countries.
1)Xenia Georgiadi who was born in Abkhazian Autonomus SSR and she was a laureat and famous throughout the USSR Some of her songs https://www.youtube.com/watch?v=1GQXWQnrXhA (1986)
3)Ansamble "Ellada.A group of singers and musicians wich performed greek songs composed in greece.The members of the group were Christos and Panos Panitsidis ,Manolis Apostolidis,Vassilis Prasodas,Suzy Theokharidi and others.They were born in Ukrainian SSR and were famous everywhere in the USSR. Some of their songs https://www.youtube.com/watch?v=FPOoci9WrqQ (Live performance in a square in Georgian SSR 1984)