Here's a stumper for you guys.
Last time I checked, the MP almost 99% of the time conducted liturgy in good ol' Church Slavonic.
Now, I was checking out the website of russianchurchusa.org this evening, and was looking at some of the parish listings, where I noticed that the cathedral in NY actually conducts liturgy in Russian!
I can see English, but can't see why some of the parishes use church slavonic as their liturgical language, but Mercurius's in NY uses Russian.
Anyone care to speculate?
AFAIK no canonical Orthodox Church anywhere uses modern Russian for Liturgy. RCs use modern Russian in Russia for their services.
As for Orthodoxy, I would not be surprised to hear that some modern Russian has been used in in some sacraments but I have never heard of it being used in any divine liturgy, other than for the homily and announcements, of course.
I have been on that site before and I went back to it now and I can't find any reference to what you mention above. Can you tell how to get there or provide a page?