It seems we agree yet again. Even if the English player deposits some fighters in Karelia, Germany still should make a major effort to capture Karelia, not only becuase it’s next to russia, but also because should you survive the counter attack the ability to place 3 tanks there per turn greatly simplifies things.
However, it is also worth it for the British player to leave the fighters in Karelia becuase they will do massive damage, and they’re not doing anything sitting around in UK, besides that, they can still fly sortees into the north sea and all, just remember to land them in Karelia instead of England. If you are a little squimish about sacraficing your fighters, think of it like this: the 12 IPC fighter will probably wind up killing (an average of 3 times I tried this on the computer version, playing myself) 2 infantry and 2 tanks. (16 IPC’s), so it’s sort of a good trade on your part.
The only point I disagree on you with is when you said that as long as Russia is out on T4-5 it’s “all good”. I believe that the sooner Russia falls, preferably by G2-3, 4 is pushing it, but after G5, the allies (unless you’re playing kids who ride the short bus) will have gotten their act togather and will severely kick your ass. I also, if at all possible, prefer Russia to fall to germany, and let Japan get Asia, Oceana, Australia, and Africa.