Such a person is known as a patriot.
patrioctic.
a person with particular skills brought in to run a country or an organisation
Defector, Traitor, Double Agent.
you call this person a "confidante"
Usually you would call the person a reader.
diplomat
An Ambassador is a senior diplomat who represents her or her country abroad.
An Ambassador is a senior diplomat who represents her or her country abroad.
An emigrant is a person who leaves their country to settle in another country.
Ambassador
Ambassador.
An ambassador.
ambassador
An Ambassador.
An expatriate or expat is a person who leaves their own country to live and settle in another country.
An immigrant.
A person from another country is typically called a foreigner or an international person.