Husband's country "doesn't recognize" U.S. citizenship?

[lpga]

My question is about how some countries who "don't recognize" dual citizenship react if their citizens gain U.S. citizenship.

My husband is a Mongolian citizen. He has a U.S. green card and has been in the U.S. for over six years. He wants to get U.S. citizenship and retain Mongolian citizenship. Mongolian law is says that "involuntary loss of citizenship" is impossible, and also that dual citizenship is "not recognized." It doesn't say getting another citizenship is illegal, or will be punished, or will result in losing Mongolian citizenship. I know that a number of countries "do not recognize" dual citizenship, but people still use their passports from these countries after becoming U.S. citizens.

The USCIS does not require him to actually go to the Mongolian consulate and have his Mongolian citizenship annulled. But let's say he gets US citizenship and keeps his Mongolian passport. When he flies to Mongolia from the U.S., he will have to exit using his U.S. passport. Then can he still show his Mongolian passport (with no U.S. exit stamp) to enter Mongolia, or will that cause problems? What happens if Mongolian officials find out that he has a U.S. passport and never renounced Mongolian citizenship? Do they just "not recognize" it and leave it at that, or are there consequences?

Also, what happens when he needs to renew his Mongolian passport in the U.S.? Does that become out of the question?

This is a hard question, so thank you in advance for any information, guesses, experiences that you can share–not just about Mongolia, but other countries with this kind of policy, too.

 

[Jackolantern]

Not recognizing dual citizenship means they see you as a citizen of only their own country and nowhere else.

To Mongolia and other countries with similar policies, his US passport is just another travel document like a visa. The US operates similarly; they expect you to use your US passport when exiting and entering the US, and other countries' passports are just travel documents.

If US citizens need a visa to enter the US, he'll have to show his Mongolian passport when leaving the US in order to prove that he has legal authorization to enter Mongolia, and also show his US passport to comply with the US requirement of showing a US passport upon exit. Similarly, when exiting Mongolia he'll show his US passport to prove that he has the right to enter the US; he'll also have to show his Mongolian passport if they have a law that requires Mongolians to show a Mongolian passport on exit. But some countries don't really care what you use to exit, so it may be sufficient to show only the US passport when leaving there, depending on what their laws say.

If the Mongolian government doesn't require him to renounce Mongolian citizenship upon acquiring another citizenship, I don't see why they should have a problem with renewing his Mongolian passport after he becomes a US citizen.