Thank you Nena, that was the Great Schism. There were attempts at reconciliation until the fall of Constantinople when the Eastern Church felt betrayed by the Western.
That was the final break.
As for icons, they are items worthy of veneration, to pry for intervention, etc. One does pray TO a saint, one prays THROUGH a saint. That is, asks for their assist in help from god.
In the case of the IF, the Russian Orthodox Outside of Russia canonised thousands of "victims of the Bolshevik regime" The IF amongst them. [hope I worded that right]. In that, they were simply victims like the rest.
The Mother Church, years later, declared them "blessed and worthy", hence "Passion Bearers".
As far as I understand it, there is some sort of reconciliation between the two now going on, but the issue of the Romanovs is not deemed an important issue, at least for now. [despite the problems of the bones...]