If the Russians stack R1, the attack has good odds for japan, but I’ve seen the battle go wrong and since its off game-start, Japan can’t affect the odds it just brings everything. The problem with doing this as Russia is that 18 men can’t attack Manchuria either–they are too weak and the Russians cant affect that until R3, if ever. On R2, Japan often has 2 more transports and could bring even more naval support, so it would be a blowout.
Either way, Japan calls the shots. Japan can attack, or not, but that’s not true of Russia all they can do is stack on the coast, or not. Until USA comes into the war and can add some defense, its just not a good move–you’re right next to Japans main base and if he reduces you, he owns the Russian East. If Japan “goes for the allies” that was probably the original game plan anyways and he’s free to ignore Russia, or not.
A J1 is awesome. But it spreads you thin as Japan and brings down the wrath of the US at the expense of UK PAC. The USA can move pretty freely across the pacific b/c of the bases, and bombers have an immense range so the USA can be all over japan in a KJF, fast.
In my experience, KGF doesn’t work. You can’t kill Germany until they’ve essentially thrown all their power away on another attack, they are simply too rich and too well defended. All the key zones are within 2 spaces of their capital, and by land. Losing fleets, Africa or Denmark still don’t mean Germany is stopped, those are just preliminary steps.
You can spend the whole game 1-8 building up enough forces to start to cut Germany (or more likely, Italy, though its loss hardly matters since the can opener is already doing its job whether Italy lives or dies) apart but if you did it 100% then Japan rages over the little buddies. Then, with Germany you dance back and forth, whereas if you can hit or threaten Japan hard enough, he has to re-focus away from his $$ objectives. Some splitting is both possible and necessary with the US–and this includes making decisions after you see what happens. But less splitting is necessary during a KJF, if the UK brings a fleet together then the US can have minimal forces in the Atlantic (1 bomber, 1 transport, 1 destroyer gives you options) and still be irritating.