The person from my old [old, old] life in Soviet Union I communicate the most with is not someone I was close with before. It is someone who I reconnected with, a little, because of the work I do in Russia and an accidental re-introduction by a business partner. All my, admittedly lame, efforts to keep in touch with other old classmates have not worked out.
I am not sure what this means other that you need at least two tenuous connections for even a minimal relationship to work. One is not enough, at least not if it is simply a shared history or geography than no longer plays a big part in your life.