In good old times they had built houses differently. In Russia there was a construction standard of two and a half brick thickness for a wall of a residential house. This was done in order to insulate the people’s dwellings from -30 frosts hitting Russia in winters.
Later, when USSR collapsed, and they started free economics the standards were no longer followed by the most of the developers due to the high cost of the brick. It is much cheaper to make a thin one brick wall and then cover it with some high-tech insulation materials that provide same heat conservation as three brick thick wall.
It is even more cheaper to buy such materials from Chinese producers. Unfortunately, those are not always made according to industry standards. Insulation layers should be extremely fire proof. Unfortunately, not this time.
The house was covered with some kind of thermo coating that got on fire very fast spreading at high speeds through all the surface beneath those rectangular plates.
No matter it was in Moscow where there are thousands of firefighters. Speeds of fire spreading were so high that none could come in time.
