I found something maybe interesting
Marina's great uncle Patriarch Varnava (1880-1937), on her mother's Rosić side. He reestablished the Serbian Orthodox Church in 1920 and while opposing an increase in power for the Roman Catholic Church in the Kingdom of Yugoslavia, he died mysteriously during the night of July 23-24, 1937. (HE WAS MOST LIKELY POISOND)
Rosic (Rosic' ) is a word in some Slavic languages meaning "Rus person".
Actualy Roman Abramovich. His last name written in cyrilic is without h at the end. This is more like an english version of a name. Russian language has probably a letter that english doesn't. So they added h so that the pronunciation stays the same.
So the last names of marina and roman are the same. Can't finde connection yet. If there is one.
Roman A. is definitely attending Bilderberg meetings, I remember reading his name on the list of attendees.