How a divided Russia could expose Siberia

What might happen if Russia divided into two states after the Russian Revolution?

Japan would probably have a strong chance of taking Siberian territory because the region lacked the manpower and industry to resist alone.

A divided post-revolutionary Russia would give Japan a strong opportunity to expand into Siberia. The region's distance and climate were formidable, but it lacked the manpower and industrial base needed to resist alone. A successor state would struggle to concentrate resources across such a vast territory. Geography would slow an invasion without supplying the missing military capacity.