Dislodging any reasonably decent-sized force which was fortified on Formosa would be a nightmare, surely? Can't see the Japanese getting very far with that, unless they can rope in the British for a real joint effort. Don't see that as being too likely tho.
The French are certainly entrenched in Keelung, and it'll take a lot to winkle them out. That said, the Japanese do _really_ want Formosa, and the British have some forces to spare in the region, particularly Naval. If the IJA wants a lot of support though, they'll probably have to wait until the Indochinese theatre is sorted out and all those enthusiastic members of the Australasian Expeditionary Force have nothing else to do.
This timeline makes me want to do a DBWI on what would happen if the war had been delayed so the Russian Naval squadron could get to the Far East, and maybe even have the railway be completed. To make it even more interesting, maybe butterflies could make the Tsar allow the General's plan in Afghanistan to be carried out. I say this because it seems that everything that could go wrong for the Russians is going wrong--I'd put money on an Anglo-Japanese victory.
Well the railway was never going to be completed in time ITTL, but the reinforcements for the Far Eastern Squadron would have made a big difference. If it had been able to coordinate with the French ships in Formosa on a joint sortie, I think the IJN would have severe problems in dealing with both and the Russians might have been able to (at least temporarily) accomplish their goal of isolating Korea from the Home Islands. They'd never be able to take the whole peninsula though, they simply don't have the manpower.
Ultimately though, the difficulties experienced by the Russians in the Far East ITTL are partly because of luck but mainly because they either don't have the neccesary resources in the theatre (Corea, Primorsky Krai) or are trying to do the impossible (Afghanistan). Short of changing the entire circumstances of the war somehow, they are going to have similar issues no matter how good their luck is.
I'm starting to consider the post-war diplomacy. [Snip interesting speculation]
I think we can sketch the road to the prologue from where we are now.
That all sounds quite plausible in terms of the grand sweep, but it's the details that matter!
I'm predicting that the Russians are buggered in Afghanistan, they'll be routed in the first major battle but then as the Brits chase them out, they'll suffer similar problems in trying to cross the whole country and you'll end up with deadlock.
So EdT, where will your cavalcade of counter-factual go next? North Africa? Congo? Alps? Westminster?
Ah, but are the British silly enough to try and push them back? I suspect that if the Russian advance collapses, Roberts will be quite happy for the Afghans to do his dirty work for him. "
When you're wounded and left on Afghanistan's plains/And the women come out to cut up what remains" etc...
As for the next part, I'm not sure tbh! I'm probably either going to wrap up the Abyssinian theatre or stay in Asia; there's also a part on the internal difficulties faced by France and Russia during the war, but that might be best saved for later on.
Oh, those Russians...
So my reading is this...[snip good speculation again]
That all makes sense- I will be returning to Russia towards the end of the TL to set down the foundations of what comes, and have a magazine interview written set in 1940 which also gives a flavour. Sadly this is not a TL where Liberal Cosntitutionalism wins the day in Russia, although you might be able to make an argument that it's still nicer than OTL. Maybe.
As for the Japanese taking Siberia, there are some very good points there on both sides I think- I'm not going to give away what happens. However, I think it's worth pointing out that Russian interests in the region are rather different from OTL, and are actually far less extensive. Without OTL's Triple Intervention, there's no new round of unequal treaties in China, so no Russian lease on Port Arthur, no concession for a Manchurian railway and all the investment (and influence) that that brings.
There is also no Trans-Siberian, not even under construction, as the Russians have concentrated their efforts on a Central Asian line. If the Russians lose Vladivostok, there might well be little incentive to build one past Lake Baikal.
All of this is a way of saying that the region is much more of a backwater than OTL, and correspondingly looms far less large in the Russian mind, especially the Imperial one- Nicholas II never had the opportunity to make his OTL visit to the Far East as he was Tsar rather than Tsarevich. This is one of the reasons why the Japanese are keen to exploit the gap while it still lasts.