Source NASA EOSDIS
In comparison, here is the July 19, EOSDIS imagery which caught earlier media attention. While covering a larger area, it was not as thick.
One of the contributing factors to the Russian fire season is severe drought that has lasted for years in part of the Russia taiga and Arctic. Here is the 6 month drought map from CSIC SPEI
In comparison, here is their 48 month drought map.
Source: CISC SPEI