Vatican Father George: As far as I know, many things in Catholicism and Orthodoxy are unusual for Protestants. For example, veneration of the Mother of God, images of saints, etc. Maybe these things ...
Other traditions accuse the Reformers of ignoring church tradition and frustrating church unity. That gets things backward.
My suggestions are based on the assumption that the unity that is being sought between Catholicism and Russian Orthodoxy, like all other serious ecumenical endeavors, is a unity in truth ...