The rules of Dual Citizenship are quite easy to understand. Most countries neither deny or recognizes dual citizenship. However, if you are a dual citizen you must enter the country with the country's passport you own.
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No, it's South Korea that does not allow dual citizenship.
Yes, Portugal and Canada both allow multiple citizenship.
No only Chinese citizenship
Nationality, or citizenship as in dual citizenship [double nationalite, or double citoyennete].
He must serve.