what do you du turn 2 when 8 inf, 2art, 6 arm + air can reach KAR if GErmany sets it up?
you can have there 9 inf, art, 3 arm. so germany gets a superior attack. if you land allied planes, all the better for Germany cuz Russia gets less money.
From what I can remember, I haven’t been forced as the SU to effectivly give up Leningrad on SU2. Sometimes I manage to take out part of the German armor (slowing their advance and giving me a third turn), sometimes I’ve been able to build up a pretty huge stack in Archangel while I retreated from Karelia (which denies Germany to effectivly take and hold Leningrad, thus giving them the bonus once).
In another case, you might build a Russian fighter on SU2 (and place it in Karelia!) to boost your defense. If you don’t feel this will do the trick, consider sending in the UK fighter (hoping there is still at least one in reach). Even if sending in this fighter costs you your NO once or twice, it will still be worth it as long as you keep Karelia.
Needless to say I agree fully on the importance of Leningrad: keeping it as the SU for as long as possible is definitly worth it.