It is a call to teach English in a country that does not speak English as a primary language. And he is not a teacher, teachers who use English as the main language.
The term is used to refer to teaching English in countries which do not speak English as their primary language. And the teacher was not a teacher of English as a first language as well.
The word is used to call in English Teaching in the country which does not speak English as the main language. The teacher is not the teacher and using English as the main language.