One other thing, if you are going to change some of the IPC values I would probably do a re-set for the Russians. Make Moscow worth more (3 IPCs really?) and some of the far east 0 IPCs so the Japanese don’t get much value. I think you can consider a 2 IPC territory out east, but I would be careful not to make it a target for Japan to take or build an IC.
I’d consider going somewhat in the opposite direction. To me the main problem with the Soviet Far East is that Russia has no motivation (=cash) and no ability (=production) to actually stay and fight over this region.
I think what is needed for the Russians is like a Soviet Far East equivalent of India. Basically a high value and strategically useful territory that the Allies must hold, if Japan is at war with the USSR, in order to have any reasonable expectation of stalling a Japanese advance towards the center.
Otherwise the Russians (and other Allies) have no real reason to invest in the area. The starting Soviet stack might stick around for a few turns, but in fairly short order (as soon Japan outpaces their ability to deadzone) they just fold into a full retreat.
I think the NAP is only interesting if it’s backed up by something effective. Japan should be just as interested in maintaining it as the Russians are.
I’d also like to see a return to convoy boxes, as an economic anchor, and a way to give the naval game a bit more independence.
Ps. I would seriously just take Evenki, Novos and the Tunguska territory between them down to a single tile worth 3 IPCs and stick a major on it! This would give the Soviets that much desired production center behind the Urals, with 2 routes into China and one to reinforce the far East.
Similarly, I would collapse Yenisey and Yakut into a single territory worth 2, so it can serve as a potential minor, and a desirable buffer tile. Rather than decrease the production and increase the distance I would go the exact alternate direction. Provide the Russians with the means to make a stand, and to go on the offensive in the case of a pacific strategy. With enough money you could flip the Russian situation here on its head, and get away from the whole idea of forcing the Russians to play a purely defensive game in the East because all their far eastern territories have been reduced into Japanese speed bumps. That’s the only way to make that region of the map dynamic in my view, since having it all carved up and worthless just puts it out of play for the Allies. I’d rather it be conceived as a position from which to threaten Japan.
It’s actually possible to play out that situation on the vanilla map, if you conceive of the territory tiles I mentioned before as being collapsed (for Russian movement and production purposes), potentially with a nod to the railways. Of course they would need money to make the theater operational, so an increase at Moscow would seem desireable. 5 or 6 ipcs would be totally justified, I’d go as high as 10 there, easily, if the rest of the map was reworked at a base 1 ipc per tile sort of play scale. I think Russia should be a power more on par with Germany, if the map is supposed to reflect the reality of World War II. Right now they’re a good 15-20 ipcs shy of where they need to be.