As a Serb, i just can notice that Russians generaly dont feel same for us, as we do for them, especialy jung generations...they dont know much about us..
But i am educated like rusofil, and majority of Serbs also...Love for Russia is part of Serbian national identity!Also love for Armenians, Ukranians, Greeks...
Religion have important role in that relationship, ofcourse ! But its not only reason...history is also important for relations between nations, and we fight in same side like russians, in many wars! We never fight against Russians, its imposible to imagine for Serbs! Also, Croatia have similar political interests in history like Germany and Austria, so they have good conection with Germans...ofcourse, Serbs dont have any conection with Germans...
I meet some Armenian people in my life, and y have best posible opinion for them! They are real real brothers of Serbs! They know much about us, our history, and they are educated in pro-serb way...Also, many Armenians live in Belgrade, and they treated with huge respect!
Generaly, i think that ortodox Slavs have much more similarity between themselves , than catholic Slavs... Maybe im wrong, but thats my opinion!
Regards!