as far as i know poles refused to call Muscovy Russia until 18th century becouse it would mean they accept russian claims on all of "rus" including ruthenia that was part of PLCThanks for good news.
3) "Muskovites" in fact never called themselves in this way. It is the term, originating from Poland, and due to the fact of the great mutual love of Russia and Poland... Well, you get the idea.