Belarussian is not Russian so there may be a misunderstanding about his name: sometimes it is written as Aliaksei Kulbakou. Kulbakov has been international since 2005 (it's a guess) and has been taking charge of qualifiers and even preliminaries to qualifiers.
Kulbakov is a UEFA category 1 referee.
Kulbakov studied economy and management in Gormel. He also graduated as football coach.
Kulbakov was Belorussian referee of the year 2004 and 2008.
Note that he was only 26 when he got his FIFA badge, so he may have a promising future.