Young attachés Kirill Matveev (30) and Aleksey Druzhin (33) held two of the most important positions within the Embassy.They worked in the referentura, the secured room at the villa on the Embassy premises, where they and their superior Sergey Pyatnitskiy (52) were among the few who had access.The work they did was so sensitive that encryption experts were not allowed to leave the Embassy premises unaccompanied, for fear that something might happen to them, or that they might come into contact with Western agencies.With encryption experts being deported from many Western European countries, it has become much more difficult for the SVR in Moscow to communicate with the spies who are still here - or so intelligence agencies in Western Europe think.The fact that Pyatnitskiy is a spy was probably not very difficult to find out for the agencies."