Russia and Poland are both Christian nations (apart from their sordid escapades into Marxist Leninism) and need to put aside their historic animosities because they share so much history and culture.
Greece is a Christian nation too, but Turkey is a mohameddan parastate. Has always been so. The relationship was one of enslaved people (Greece) and enslavers (Muslim Turkey).
Huge difference.
For the purposes of civilization [i.e. way of life]comparison the Orthodox could just as well be heathens. One is not looking at doctrinal differences here - that's why the Protestant Christians are a part of [originally Catholic] West and Orthodox aren't.
Sorry but the Polish nation hadn’t any “escapades into Maxist Leninism”. There was no communist revolution in Poland cause there was few communists in this country. Communism was installed from the outside, thanks to Soviet Union. The Poles were also the first who came out of Soviet sphere of influence.