A person who betrays his country - in other words: commits treason - is called a traitor.
Traitor
The commonly used term to speak about a person who betrays his own country is the word "traitor".
This person is called a betrayer.
A traitor.
This would be treason.
Someone who betrays their country is called a traitor
The name of the person that betrays you is Major Shepard.
A traitor is a person who betrays someone else or a group/organization. They could also be someone who commits treason against their country.
If a person betrays the government they are a traitor. They are helping a foreign power to cause harm to their country.
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traitor
Somebody who is disloyal or treacherous according to Websters dictionary.