The nationalism of the Russian Orthodox Church was one of the complaints of the communists before the Revolution. As far as they were concerned, the church and the Tsar were hand in glove.
It was a situation that gave a lot of clout to Marx’s usually distorted quote -
Read in full, Marx could be seen as protesting more about a heartless world, with religion as the protest against the distress. But the Bolsheviks used the bit about “the opium of the masses (people)” as a criticism of the church in Russia in particular, since for the downtrodden peasants it was their solace, but it was also being cynically manipulated by the Tsar and his supporters.
I lifted the following passage from this link. I’m not sure just how accurate it is, but I do know one of the complaints of the Bolsheviks was that that the Russian Orthodox Church was a Tsarist government department.
alphahistory.com/russianrevolution/enforcing-russian-autocracy/
In a way this was a natural progression from the Byzantine Church with its headquarters in Constantinople. When Constantine created Constantinople as a bulwark against pagan invasions, he also moved his court there. The seat of the old Roman Empire thus moved to Byzantium, and became the new Holy Roman Empire. That is to say the Roman Empire moved East, and was no longer based in Rome.
Protestant fundamentalists please note.
The Emperor was the head of the Byzantine church, unlike in Rome which had by then almost become a backwater, with authority gravitating to the Bishop of Rome. As such he didn’t have the same subservience to imperial authority that was required of Byzantine archbishops.
Nor did they ever have a Protestant Reformation, such as Western Europe experienced. Not that the Reformation meant an end to state domination of the church - in many states, the Protestant churches had their local rulers as their titular head. The Anglican Church still does, possibly because the UK has never since had a revolution or been conquered, which results in others interfering with the rule book.
So the dual challenge of a “stateless” church as tended to be seen in Rome (despite the exception of the miniscule and eventually lost Papal states) and the violently seized opportunity to critically engage accepted dogma and tradition as experienced in the Reformation never eventuated for the Byzantine Church, and it’s later heirs, the various Orthodox Churches.
In short, their tradition has been different.