The North Koreans did manage two flights to MAN with IL62 P-882 in connection with the World Student Games in Sheffield in the early 1990s. On both occasions the crew managed to stay with their aircraft and return home, so set a precedent. I doubt the crew ever considered defection, knowing the consequences for
their extended families left back home.
The only time I have seen one of their machines. And probably ever will. Legion though the attractions of Pyongyang are, I can't see me bothering.