A close friend, from Greece,  told me that the Orthodox teach that they are the "one, true, church".  Why would they wish to submit themselves to the Roman pope, who leads a church that does not recognize this "truth"?

I know little about the Orthodox in Russia, Europe and elsewhere - only of the US diaspora. There are several Orthodox congregations (Russian, Syrian, Serbian, Greek) within a few miles of my home. If all are like my friend's (Greek) church, culture is the main tie - of paramount importance -  not theology. Plus they have married priests, accept birth control, and the divorced/remarried can receive communion.

Unifying christians under one roof  may not be best  for christianity.  No christian denomination has everything "right"- yet all are "the church".  Christians can learn from other christians. The RCC refused to reform when needed - hubris - and now it's centuries too late to forge the thousands of pieces into a seamless whole. Hubris is still the RCC's main sin