"One of the highest of the high in the NSF organization, Lebedev is the moneybags behind the whole operation. You've got to hand it to the guy: in a world that's going down the toilet, he's doing okay. He's got his own multi-level jet, his own hangar at the airport, loyal troops and enough cash to go anywhere he wants. A man like that would have a much longer, happier life expectancy if he's just fly off to a tropical island somewhere and not get involved in politics and terrorism. Lebedev has two primary talents. He's a researcher and a talker. You can learn an awful lot from a guy like this, but keep in mind that he's not going to tell you what he doesn't want you to hear. Of course, that goes double for everyone else you know. It's a tough world for an enthusiastic young agent like yourself, and Lebedev can make it tougher."
When Paul Denton was ordered by UNATCO to kill Tracer Tong, Lebedev managed to prove to Paul that UNATCO was really a corrupt arm of the conspiracy group Majestic 12. Also, evidenced by the datacubes found in NSF strongholds, he was responsible for the operation to distribute Ambrosia to the masses, as well as the NSF resistance in Hell's Kitchen.
When JC arrives at his 747 in LaGuardia, Lebedev tells JC about UNATCO's corruption, JC and Paul being products of genetic engineering, not natural birth, and the name of the conspiracy group controlling UNATCO (Majestic 12). During this interrogation, Anna Navarre arrives and orders JC to kill Lebedev or let her do the job. Here, the player can choose to kill either Lebedev or Anna. It is possible to leave them both alive, but this takes some amount of skill (Anna kill Lebedev if the player walks away). If the player refuses to kill Lebedev, Manderley scolds JC for his insubordination. Sparing Lebedev's life does not save him, however, as he is ultimately captured by Majestic 12 and executed. His murder is blamed on JC Denton, as later discovered through media sources.
Juan is not a conventional Russian name, although it is not completely impossible for a Russian man to have it; for example being named after a famous foreigner. The Russian equivalent for this name would be Ivan. Icarus Effect states that he also has a minor Chicano (Mexican-American) inflection in his accent, and together with his first name this suggests that he is also of Latin American heritage.
Ivanovich is a patronymic name, meaning that his father's first name is Ivan.