They show some dedication in travelling all the way to Siberia to set these fires off!
Wildfires in Greece, Turkey, Spain and California too during heatwaves. I am sure that has nothing to do with it and the only reason they are spreading so fast is because multiple members of the arsonist mafia are starting them in a spread inductive to widespread devastation.
p.s. I do note that arson can be a trigger point, the fires in Turkey may have links to the PKK. However, it clearly doesn’t explain spread or why they’re so deadly during heatwaves.