I think it better to neutralize England, then go after Russia.
Round 1: France/British Fleet
Round 2: Set up convoy raids, bomb England into dust
Round 3: Bomber England back into dust
Round 4: Attack Russia
And I wouldnt worry about all the AA Guns, they’re no where near as powerful as people make them out to be. They dont get 3 shots per aircraft, they get 1 per aircraft up to a maximum of 3 aircraft, so they’re actually much weaker there. They have no attack or defense value so no change there. They still only move one and count as a mechanical unit on transports, again no difference. The only difference is that they count as a unit that can be taken as a casuality. And that change was only to stop Sea Lion from succeeding 98% of the time on Germany 2. England should never have been so easy to crush, neither should India have been, which is why India was changed and now England is too. Perhaps you would have been happier with no change to AA Guns but with France getting another infantry and England 4 more infantry? No, I wouldn’t have liked that either, so let’s take this as it is.
AA Guns are a lot more prominent now. It’s reasonable to expect to use AA Guns in multiple stacks of units as you would armor or fighters thus pulling them out of the backranks or getting them out of large stacks of units so they can be more effective. I’d be willing to toss 4 infantry, armor and AA Gun up for Russia as a blocker against Germany now, or vice versa.
The change to Japan is AWESOME! You can still attack Amur, but you have to do it from the sea, good! There is still the non-agro agreement, but now it has to be agreed too. I think the official house rule will be 12 IPC as per Alpha 2 for either side attacking. (The Mongolia change only effects Japan, but the non-aggression agreement effects both sides.)