republic vs satellite state

republic

noun
  • A state where sovereignty rests with the people or their representatives, rather than with a monarch or emperor; a country with no monarchy. 

  • One of the subdivisions constituting Russia. See oblast. 

satellite state

noun
  • A country that is formally independent, but under heavy influence or control from another country. 

How often have the words republic and satellite state occurred in a corpus of books? (source: Google Ngram Viewer )