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A person who betrays his country - in other words: commits treason - is called a traitor.
traitor
karma apparently
The commonly used term to speak about a person who betrays his own country is the word "traitor".
Country or ruler as these could be their king,queen,president or prime minister!
When someone betrays you, how do you react.
A traitor is a person who betrays someone else or a group/organization. They could also be someone who commits treason against their country.
Traitor
A person who betrays is a traitor or a turncoat. A person who betrays another is also called a Judas.
A traitor.
Somebody who is disloyal or treacherous according to Websters dictionary.