Originally Posted by Za Rodinu

They did, but after the Khalkin-Gol and Nonmomhan disasters and the involvment with the Sphere of Cooperation plus Pearl Harbour, they gave up on those plans.

Besides who cares for a barren desert where you see grass for only three months in a year? There was nothing in Siberia but empty vastness.*

What northenr resources? While there were the rich pickings of rice, oil, rubber, metals, etc in China and Southeast Asia, why go for snow and grass? Besides, as for what concerns North the already had Manchukuo and that was Northern enough for them.