Turkish women lean more towards their pre marriage families even after marriage, whereas Russians visit their parents once a year, this is unthinkable for a Turkish woman.
I think it is a subject worth discussing since it seems to be part of the Turkish male history to want to marry non Turkish women. I would expect the number to be higher, among Turks living abroad, for the obvious reason of availability of local women vs. Diaspora Turkish women also marry more foreigners too.
I think I saw somewhere that many Turkish men marry Russian women. Russian women and Turkish men are a pretty good match.