Where did Krustov ? the first soviet leader after Stalin come from and why he was chosen?

Do you mean Kruschev? He came from the USSR (Russia) and he became Dictator because he was elected, but not freely because it was only the communist party people could vote for. He was leader for less than ten years I think :/ and he was generally unpopular amongst Russians which explains why he didn't last long and was forced to resign. I would imagine Kruschev lived in luxury like all the communist leaders did (whilst general Russian people were poor). Politically Kruschev attempted to be more peaceful than Stalin. That's all I know though :/