Why are some areas of Russia more populous than others?

They have better climate and no permafrost

Some areas of Russia are more populous than others due to a combination of factors such as better climate, access to natural resources, economic opportunities, historical factors, and infrastructure development. These areas may have more favorable conditions for agriculture, industry, trade, and overall quality of life, leading to increased migration and settlement. Additionally, regions with no permafrost may have more suitable conditions for habitation and development compared to areas with harsher climates and limited resources.