What are the immigrant countries that recognize dual citizenship?

There are three ways to recognize dual or multiple nationalities in today's world: explicit recognition (or full recognition or active recognition), indirect recognition (default) and conditional recognition (or exceptional recognition).

Most countries recognize dual nationality.

More than 20 countries, including China, do not recognize dual citizenship.

Besides China, the other 26 countries include Myanmar, Laos, Malaysia, Mongolia, Brunei, North Korea, Nepal, Belarus, Bhutan, Bahrain, Oman, Kuwait, Zimbabwe, Botswana, Saudi Arabia, United Arab Emirates, Kenya, Tanzania, Niger, Mauritania, Mozambique, Papua New Guinea, Vanuatu, Micronesia, Cuba and Suriname.