Confusing Russian Aircraft.

MiG-33, MiG-35, Su-27SM, Su-30, Su-35BM, Su-35, Su-37
All these aircraft have been touted as the future of the RuAF, but which ones are actually going into production to be the future backbone of the RuAF? Likewise, with most of these planes they all seem to do the same thing, so is only one of them going to be inducted? Some help would be appreciated.