Do you have more information on how Russia's Eastern regions are becoming more habitable? I know they have a development fund to incentive people from other regions to move and develop small businesses (especially in agriculture).
A lot of this land is nutrient packed as well. Siberia could be prime growing land if it gets warm enough. Similar to Ukraine today.
Saying that, there are a number of concerns about soil resilience in Siberia. If soil resilience doesn't improve, Siberia will remain very poor for agriculture.