Who is Gregor Suslev from Noble House: A Novel of Contemporary Hong Kong and what is their importance?

Soviet intelligence agent, Captain Gregor Suslev, is aboard the Sovetsky Ivanov. He is assigned to take over Voranski's work after his death. Suslev's assignment is fraught with leaks and other problems, which cause trouble for him with Moscow Center. Suslev survives the mudslide.