Cyrillic is literally greek+glagolitic and it was partly a diplomatic creation of the Eastern Roman Empire(aka Byzantine Empire), in order to bring the slavs culturally closer to them.

Russians have nothing to do with it, other than them claiming they are the continuation of Eastern Roman Empire, something which is kinda laughable but whatever dont let your dreams be dreams.

They wanted to use the geographical definition of Europe, so they cut off everything beyond the Ural mountains and Caspian sea.

It is. Europe is commonly defined all the way to the Ural mountains, which are located somewhere in the middle of Russia. Most of russian population lives in Europe.