There's lots of Aikido in Russia, and even in St.Petersburg in particular. I don't know where exactly Alexandr trains, judging from the general popularity patterns, probably one of the Aikikai dojos. Me, I'm Yoshinkan
not that it matters, it's still Aikido. Just to illustrate the activities, we have just recently had a seminar led by Kenji Nakazawa, 5th dan, and if all goes well, in June Ando Sensei is coming for a seminar - it's a great honor, and a wonderful opportunity to learn.
I will be putting photos from the last seminar at http://mbravo.spb.ru/gallery/aikido
soon (this weekend, in fact, so check it Monday, if you are interested).