1. East-West opposition back 1000 years ago was 100% religious matter, the schism between East and West Christian churches.
2. The stance of Putin and some politicians against the West nowadays.
Spreading the alphabet back then meant spreading it in clerical writing. IIRC, Catholic church back then required doing services in Latin, while Constantinople allowed it in local languages -- hence the need for translation and that's why Cyrillic developed from Greek, the primary language and writing system of the East church.
I don't see what Putin has to do with this at all.