There is nothing backward about the Russian Orthodox Church. Obviously Pyor Romanov (if this is his real name!) had no clue why the Church is separated and what reasons prevented Russia from receiving the Pope. He certainly ignored the whole Uniate issue and justifiable theological basis for ROC's steadfastness.
The fact that some other Orthodox countries were visited by the Pope is more an expression of those countries' political weakness and their churches' lack of resolve (and character) to negotiate with Rome from the position of parity, but rather from the position of weakness and submission.
Let's not forget that Russia is the backbone and the pillar of Orthodoxy and that the rest of the Orthodox in the world are but a small and disunited peripheral factors that Rome could gobble up one by one.
Pyotr Romanov did not use the word "backwardness". I did in some paraphrase, which may or may not be accurate. It is not clear if the author longs for some superficial westernization, which would be a bad thing for Russia, or for true spiritual unity. You should give him a benefit of the doubt and assume the latter.
The notion that the Vatican goes around gobbling up smaller churches is unfortunate and seems to me a part of the same petty intransigence that prevented the Pope's visit to Moscow. I've lived in some areas of Slavdom with strong Catholic presence, and travel trough others, and I can assure you that I saw no trace of the Swiss Guard occupation troops anywhere.
On the Filioque issue, do the Orthodox dispute that Christ breathed the Holy Ghost into the Apostles? If they don't then we have a textological problem and not a theological one.