I'm not talking about published regulations, I'm talking about counterintelligence doing their jobs. Russians/Soviets were always almost dumbfounded at the ease at which they could penetrate very sensitive sources. Apart from the UK and to a lesser degree the US it was a total free-for-all even before the USSR broke up.

Fabricated personalities can and do get exposed.

There's no point explaining the Russian corruption to me, I lived there for a long time. In this case, however the corruption machine works against Russian agents.