>>715255
To quote from New Advent, a respected catholic source:
http://www.newadvent.org/cathen/06111a.htm
>"Nevertheless the reunion of the Churches was not yet an accomplished fact. The Greek representatives insisted that their aforesaid declarations were only their personal opinions; and as they stated that it was still necessary to obtain the assent of the Greek Church in synod assembled, seemingly insuperable difficulties threatened to annihilate all that had so far been achieved."
>"The question now was to secure its adoption in the East. For this purpose Isidore of Kiev was sent to Russia as papal legate and cardinal, but the Muscovite princes, jealous of their religious interdependence, refused to abide by the decrees of the Council of Florence. Isidore was thrown into prison, but afterwards escaped and took refuge in Italy."
So, Russia was kind of a bust.
Let's see what was was happening in Constantinople.
>The new emperor, Constantine, brother of John Palaeologus, vainly endeavoured to overcome the opposition of the Byzantine clergy and people. Isidore of Kiev was sent to Constantinople to bring about the desired acceptance of the Florentine "Decretum Unionis" (Laetentur Coeli), but, before he could succeed in his mission, the city fell (1453) before the advancing hordes of Mohammed II.
So, in short, though the emperor tried to force it, the council didn't get to be ratified officially, so it wasn't truly a valid council, in the orthodox view.
And after the city fell, the anti-unionist party rose to power, justifying the fall of the city while under a unionist patriarch and emperor as God's sign that the Union was heretical.
The sultan was ok with that idea, for obvious reasons.
Meanwhile, the Pope tried to rally a crusade to reconquer the city from the ottomans("His call went out to the rulers of Europe, in an agonized plea to turn from internecine warfare to face Christendom's common enemy"), but no one was supportive of that stuff, except Vlad the Impaler.
As time went on, the Orthodox drifted away from the idea, and the rest is history.
We would do better to focus on what we can do today to reunify the Churches.