Ok, point of order. The family name Komnenos is properly pluralised Komnenoi; a Komnenid is a half-breed, a Komnenos-ish person, just as a hominid is a manlike being. And its plural is not Komnenids but Komnenidae.
My point about the friendship of the Bear is not that it was a bad thing because it benefited both parties. It is that, being based only on mutual gain and not on any real commonality of outlook or community, it naturally lasted exactly so long as the mutual benefit did. Had Russia seen benefit in dividing Rome with the Caliphate and thus getting a border with that powerful nation, that is what would have happened. Now reasonable men might differ on what was in Russia's interest at the time, but the point is that at no time did any Czar think "Rome is a friend, I won't take advantage of their troubles." Rather the Czars thought "I'd rather have a weak-ish Rome than a strong Caliphate for my neighbour." This was to Rome's benefit, well enough; but it was not friendship.