The president appoints "Ambassadors" to serve in other countries.
Actually, several presidents have been called that in different countries. George Washington is the US president so honored.
Someone who betrays their country is called a traitor
It is called international calling or an overseas call.
a leader of our country is called a president
If a country is governed by another country it becomes a colony.
it is called a presidentceremony
Someone who is probably called the President
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The period of time during which a president is in charge is called his (or her) term of office.
That person would be called a missionary. The work would be called missions.
an alien
an alien