I read that a while ago, and found it compelling, but had talked myself out of it -- if he was really blackmailing presidents, the CIA would have stepped in at

I read that a while ago, and found it compelling, but had talked myself out of it -- if he was really blackmailing presidents, the CIA would have stepped in at some point, had GRU not gotten in there first. The Mossad route taken in the parent article provides other possibilities