1. Yes, I am Ukrainian-Hungarianare you from ukraine or something you seem to have good understanding of what has happened but also i think it started much earlier back when Moscovyy after Kyiv being destroyed/in ruines they took the title for being the main Rus or whatever they did basically stole the title and history which is why until this day they trying to destroy Ukraine to fully claim the history they stole
2. Kievan Rus has three descendants: Belarus, Ukraine and Russia.
3. Moscow was created in 11something, maybe 1143, forgot. Russians are closer to Mongols and Mongolian kaghanat.