Note- just remember that St.Petersburg, NOT moscow, is capital of russia in 1900. This is good to bring up in negotiations, if the other player doesnt know that, he will show you more respect, if he does, he will assume you are a good opponent.
St.Petersburg to me is one of the most (hinterhautig) provinces. It serves very well in a very early Russian attack on Scandinavia, a move most of the time imliciting a more or less direct attack on England..
St.Petersburg is a vital part to the big stalemateline, this is important to remember when trying to stop Italy, Turkey or Austria from getting the magical 18sc.
Unit Norway and Finland support Unit St.Petersburg and it's impossible to take it from the south.
And if at the same time Munich and Iberia is secured no southern power can get more than 17 sc (with no units past the stalemateline that is)