You don't specify a timeframe, but I presume you mean in the period leading up to WW2.
The usual problem with ideas like this is working out why the Japanese decide to go after Siberia instead of the resources of Southeast Asia, and in particular the oil fields. Yes, we know now that Siberia has a good deal of oil... but they didn't know it then. More importantly, those resources can't be extracted without techniques that were developed in the 1950s IIRC, making them inaccessible even before considering the extreme conditions involved. Without that, there's nothing for the Japanese in Siberia that they can't get more easily elsewhere. So why do they decide to prioritise it?
Once we know why they're there, we can make some sort of guesses about how they might go about trying to achieve those goals. That will in turn inform speculation about how others will respond.