Sure they did.

You may like to reread post #856 and think about the difference between “the” in your writing and “some” in the CEncyc.
What can be said, in the absence of public opinion polls on the matters, is that, while controversial, the union persisted in the Byzantine Empire until it was repudiated under the Sultan.
As to the Russians: I have called your attention many times to the writing of then Bishop Tikhon of the OCADOW (on the Indiana list) that dispels this common story as total myth. In Muscovy, the rejection was the unilateral action of the Czar, period. In Rus, the union held formally until the late 1400’s and informally into the 1500’s; within a century it would be reprised as the union of Brest.
Finally on the invidious comparison between England of the 1530’s and the Council of Florence: This is not atypical for you. You have written similarly about the Unias. It is as though you would consider it as duress most foul if a Catholic were to offer a ham sandwich to an EO - equal to the murder and mayhem executed by EO’s against Greek Catholics. I will continue to point out that these disgraceful comparisons are disgusting.