Eh, I got huge AE for integrating russia, something like -200, but I was larger than poland.
From what I've seen in one of my games, becoming a republic doesn't break PUs (even when the senior is a republic). Might have been changed, but I suspect that it can still happen.
Integrate, when you feel they have colonized enough.
I almost never integrate/annex large countries until the very end of the game. You're actually much stronger militarily than if you had all of that land yourself.Is there ever a reason not to integrate a junior partner (excluding HRE electors)? Even if you subsequently decide that you didn't want all that land after all, you can re-release them as a vassal, and AFAIK vassals never break away unless their suzerain is forced to release them by some third party.
In general, yes, but Russia may be an exception. You won't get the huge Russian doomstacks without Russia using its NIs, but you as the player will be much better at developing the provinces in Russia than the AI. You'll be swimming in money that you can use far better than the Russian AII almost never integrate/annex large countries until the very end of the game. You're actually much stronger militarily than if you had all of that land yourself.
Eh, I got huge AE for integrating russia, something like -200, but I was larger than poland.
In general, yes, but Russia may be an exception. You won't get the huge Russian doomstacks without Russia using its NIs, but you as the player will be much better at developing the provinces in Russia than the AI. You'll be swimming in money that you can use far better than the Russian AI
This is why the vassal income should be a slider, allowing transfer in either direction. So I can give them some amount of money per month (anything up to half my income or so), or no-one gives anyone anything, or they give me money.
Ideally that would go along with increased revolt risk and other downsides the more I take from them. But if it just capped out at 50%, as now, but now also allowing me to take less or give them money instead, that'd still be way better.
We might get that for all vassals eventually, given that new colonial nation vassals will quite likely have some sort of system like that.
By no means should you ever maintain a PU indefinatly, never. It will break sooner or later.
Best bet is integrate then re-release as a vassal, then you still get the Russian Hordes doing your bidding, a huge jump in income, and it will never break.
If you decide to integrate and keep the land, I sure hope you are already Orthodox, because that religious unity is gonna hurt.