I don’t think they stole them. Clinton and obama gave them plans quite willingly and willfully.
Clinton did it for illegal campaign donations, Al Gore was the bag man. Remember those monks (who vowed poverty) and all the millions Gore brought back? Remember Los Alamos and the missing hard drives? Remember Bill Richardson was head of the Dept. of Energy that ran Los Alamos? Remember his testimony before Congress? Remember When Ho Lee the attempted patsy? Too much risk.
They wised up, now they just let it get "hacked" by unnamed "hackers".