Why would they? Controlling a population that is hostile towards you is an absolute nightmare. Americans should know, they tried it many times. So did the Soviets and it never worked out. Kiev's population has a Russian minority of less then 15% while in the eastern two breakaway republics the majority is. Have you ever looked at a map of Ukraine?

The problem with people like you is that you don't actually listen. You don't really have to agree with what the other side says, but you should at least listen instead of just believing what you want to believe and what the voice inside of your own head says.