OK. What files, exactly? soviet.inc in the 1936 folder at least, I assume.
EDIT: I edited that file and 0_gc_1936.eug but when I select Russia in the 1936 scenario the game crashes... help?
EDIT again: Found out I manage to write RUSV instead of RUS in one place, edited it and it worked! Now time to change the cabinet.. I'll try and use the HoI2 FAQ for it and see how it goes.