What is the Eastern spin on Ferrara-Florence? As I understand it, the Turks offered the them a choice, and they chose to renounce a Church council (both lungs) to avoid worldly annihilation. Their decision was certainly understandable, (nobody said this would be easy), and I don't know if I would have done differently in their shoes, but how do your leaders explain it? I am genuinely curious, and ask this with all respect due a brother in Christ.
Russia rejected Florence/Ferrar at least as forcefully as did the Empire, even though they were under no Turkish threat. The Emperor at the time, the one who would be swayed most by worldly concerns, backed the False Union, as did most of the bishops (including all the delegates, except St. Mark of Ephesus). The Union foundered because it involved accession to false Latin doctrines, rejected uniformly by the ordinary clergy, monastics and laity (including the Empress).
The Russian delegate, one Archbishop Isadore, was deposed as a heretic and exiled. He was later made a Cardinal by the Pope of Rome.
The Orthodox take on the spiritual basis for the final demise of the Empire, is that the last Emperors become too worldly, seeking aid from the Latin heretics, rather than from God.