nope
You may defend together but never attack since the UK ships are not “placed on the battleboard” they can take no hits.
For these questions, answer it by using what most good players play with, not just the “actual” rulebook. So use LHTR or what is standard by “expert/tourney” play.
Lets say Moscow fell to Germany, then Berlin fell to Moscow, but Moscow is still owned by Germany.
1)Does Russia still collect Germanys income?
2)If so, is Russia able to buy things with that income in Berlin?
3)Can Japan take over one of Germany’s start-of-the-game-territories, which is currently still owned by Germany, by placing one of Japans units on it?
4)Can Japan take over one of Germany’s start-of-the-game-territories, which is currently owned by the enemy, if it had a land unit survive the battle for it?
I think it’s:
1)Yes
2)No
3)No
4)Yes
You would think that #3 would be yes. Why wouldn’t you be able to use that countries territory as your own, if you entered it with a unit? Its capital has fallen, you would think the populace would work for you, being an allie and all. How is this much different than #4?
I don’t think capitol swap rules have changed between out of the box and LHTR 2.0 but I could be wrong. Based on my understanding of the rules:
In games with capitol swaps, the allies could deny Japan income by leaving gray territories like West Russia, Belorussia, and Ukraine alone until they are holdable. I agree with how you tried to rationalize #3 being true but I think that’s just how the rules work.
For #1, when I say collect Germany’s income, I mean the money that Germany had. Since you get all income from a Country, when their capital falls. This isn’t the same thing as actually “collecting income” at the end of the turn.
I think it’s:
1)Yes
2)No
3)No
4)Yes
You’re right, whether using the box rules or LHTR. Taking a power’s IPCs by taking their capital is not income, so you can collect it even if your capital is held by the enemy.