[BeauBo]

Their nuclear engineers would probably just move to a Chinese Research city, if forced to leave the country.

[TigerLikesRooster]

That is a real possibility now that I think about it. In that case, China will decide how many of them would be allowed to return. Another bargaining chip for China. However, NK may want to keep their mouth shut even to Chinese regarding details on NK program. At least the life of some of them would be in danger.