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 and
http:/yoshinkan.spb.ru/ soon (this weekend, in fact, so check it Monday, if you are interested).