What do you see as the reasons for the disagreement between ecclesiastical and secular authorities?

Church reform Patriarch Nikon: Church books based on Greek models, three fingers were adopted, the eight-pointed cross was replaced by a four-pointed one, the direction of the procession was changed, the number of prosphora was changed. Rapprochement of the Russian Orthodox Church with the Greek towards the unification of church services (geopolitical interests and increased centralization of the country).