The Catholic church sees Rome as supreme. The Orthodox, while similar in much doctrine is NOT the same as the Roman Catholic church. The Orthodox, while sometimes a persecutor itself was also persecuted by Rome and others as they are being today. They have supported Roman primacy off and on (more on than off today). The Western churches were largely persecuted by the Roman Catholic institution - not the Orthodox. ROMAN because the seat of that institution is in Rome.
http://www.staycatholic.com/ecf_primacy_of_rome.htm
http://www.newadvent.org/cathen/12260a.htm
http://www.orthodoxresearchinstitute.org/articles/church_history/michael_theschism.htm
http://www.timesonline.co.uk/tol/comment/faith/article2056515.ece