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How about Japan? You use your Canadian passport to enter Japan and use your Vietnamese passport for exit.

I would really NOT recommend - anywhere - using a different passport to enter and leave a country [meaning at passport control]* (see my post above). What you show the airlines is a different thing, because the airlines are most/only interested in identifying whether or not you'll be admitted to the destination country.

* Obviously for countries like Canada and USA that do not have exit controls, then which passport you show on exit ... well, you just don't except to the airline.
 
Does Japan allow dual citizenship?

Japan apparently does not*, but it's NOT relevant to this person (the OP) because Japan's restrictions only apply to their own citizens.

Note, I'm not aware of ANY country that polices 'dual citizenship' with respect to nationals of other countries. (Although it's possible there are some, I'd imagine some arab countries might have issues with citizens of other arab countries also holding Israeli citizenship - as some used to not allow entry to citizens of any country with Israeli entry/exit stamps. Anyway, no need to look for exceptions to a general rule)_

*From the internet, but note I've no idea how strict japan is about this - an issue with many countries with dual citizenship is whether the law is enforced (how?) and how harshly.
 
That's the question I'm asking you.
I don't know about Japan, if its allowing dual citizenship. But the issue is, are you allowed to use a passport from a country you are not a citizen? So, would you answer this question, please?
 
Japan apparently does not*, but it's NOT relevant to this person (the OP) because Japan's restrictions only apply to their own citizens.

Note, I'm not aware of ANY country that polices 'dual citizenship' with respect to nationals of other countries. (Although it's possible there are some, I'd imagine some arab countries might have issues with citizens of other arab countries also holding Israeli citizenship - as some used to not allow entry to citizens of any country with Israeli entry/exit stamps. Anyway, no need to look for exceptions to a general rule)_

*From the internet, but note I've no idea how strict japan is about this - an issue with many countries with dual citizenship is whether the law is enforced (how?) and how harshly.
Lloks like @steaky is confused about a third country if it would allow you to enter its territory holding another country's passport, valid or not.
 
How about Japan? Can you use your Canadian passport to enter Japan and use your Vietnamese passport for exit?

Oh my question wasn't about that. Mine was for using my Canadian passport to enter and leave Japan. I will use my Vietnamese passport to enter and leave Vietnam. It's just that my transit home might be through Japan, so I want to stop by and use my Canadian passport then, if possible
 
Oh my question wasn't about that. Mine was for using my Canadian passport to enter and leave Japan. I will use my Vietnamese passport to enter and leave Vietnam. It's just that my transit home might be through Japan, so I want to stop by and use my Canadian passport then, if possible

Shouldn't be an issue.
 
Oh my question wasn't about that. Mine was for using my Canadian passport to enter and leave Japan. I will use my Vietnamese passport to enter and leave Vietnam. It's just that my transit home might be through Japan, so I want to stop by and use my Canadian passport then, if possible
You can use any valid passport to enter a third country. Whichever passport you use determines which citizenship you have for that country.

If you enter Japan with your Canadian passport, then you are a Canadian while inside Japan, even though you also hold a valid Vietnamese passport. And same goes if you use your Vietnamese passport instead, you are a Vietnamese in the eyes of Japanese immigration.
 
Lloks like @steaky is confused about a third country if it would allow you to enter its territory holding another country's passport, valid or not.

No, you are the one who is confused about a third country if it would allow you to enter its territory holding another country's passport, valid or not.
 
No, you are the one who is confused about a third country if it would allow you to enter its territory holding another country's passport, valid or not.
No, I'm not.
 
Jeez, using a passport from a country you are not a citizen of, is illegal. Fraud, plain and simple.

You missed the point that some countries have "overseas citizen" and "citizen" and both their passports are issued from the same country. "Overseas citizen" does not have the same right as "citizen". It's legal, plain and simple.
 
You missed the point that some countries have "overseas citizen" and "citizen" and both their passports are issued from the same country. "Overseas citizen" does not have the same right as "citizen". It's legal, plain and simple.
So, are you allowed to have a country passport from a country if you are an "overseas citizen"?