Is Russian Orthodoxy the same religion as Greek Orthodoxy, etc.?
Russian Orthodoxy is the same religion as Greek, Antiochian (Arab), Romanian, Bulgarian and Serbian (etc.) Orthodoxy. Remember that in Orthodoxy, the Church is a family of Churches in communion with each other, and that these Churches are independent of each other in government, even though they hold the same faith. So, in Europe and the Middle East, each country or ethnic group has its own Church, usually geographical, that is communion with the rest of the Orthodox community worldwide.