The Invasion of the Kiaven Rus by the Mongolian Empire

Komete t go su dar swenai says, Can you tell us about the invasion of the Kiaven Rus by the Mongolian Empire? And why it doesn't have an influence over modern day Ukraine. "It'll take at least 4 to 5 years for India to attain that level," he says. 'I'm sure we can crank out the missiles at a reasonably rapid rate'