Top 5 countries without dual citizenship policy

There some countries that do not allow and a citizen Isn’t allowed to hold two citizenships at the same time and here is the lesser top 5 Top 5 countries without dual citizenship policy

• Japan : Japan does not allow dual citizenship and strictly sticks to the one citizenship policy.
• Cameroon: quite a shock, but French-speaking nation, Cameroon doesn’t allow its people to hold any other citizenship.
• Saudi Arabia: Saudi Arabia straightforwardly does not allow its country’s people to hold citizenship along with any other nationality.
• China: no doubt as a reserve to China is with its informational mass media policies, so is with Chinese citizenship, one source citizen has most to another country like Singapore didn’t have a right to hold a Chinese citizenship.
• Ethiopia : Ethiopian government is also particular about one citizenship rule and does not allow Ethiopians   to bear ny other citizenship along with Ethiopian citizenship.