One might ask why twenty plus years on, the experiences of the author might have some significance other than to the historians of intelligence and the students of tradecraft and organization.
The primary reason I first bought this was that it dealt with Soviet SIGINT operations. Of course, one must keep in mind that in return for his exfiltration and a new start in the West, the suthor will not reveal anything that our side does not want him to even though the other side may have known what he revealed, we might not want that known by a third party in the intelligence business.
What is most relevent here and now is that the author was in the KGB, thoroughly understood its mindset, and broke with that mindset. It has been said that the KGB with its world wide tentacles was the only part of the USSR government that truly knew the situation both politically and economically.
Just because the KGB no longer exists in its old form, it formed the base of the Russian intelligence service of today. And most important of all, power has settled in the hands of Putin, who no matter how affable and westernized he may seem, spent all his working life in the KGB and its successor.
Consider that fact with the author' opinion that the Stalinists may come back. I think they will not but that authoritarianism very well might. After all the Russian never lived in a democracy before Communism and have no experience with it. And observe the semi anarchic business and social conditions in Russia. Belarus has already gone back to authoritanism.
Thus, this book remains useful for studying the other side, whether they prove to be friends or foes again.