According to the UK, the fire occurred on the evening of November 21.
A married couple, their 10-year-old son, as well as an eight-year-old boy who was visiting them, died.
A case was initiated under Part 3 of Art.
109 of the Criminal Code of Russia (causing death by negligence to two or more persons).
Earlier, three people died in a fire at a poultry farm in the Khanty-Mansi Autonomous Okrug.