Where is the most difficult place on Earth to gain citizenship

Difficult countries for gaining citizenship and their requirements.

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Vatican City: Citizenship for cardinals or Catholic Church officials.

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Bhutan: 20 years residency, no anti-king or country activities.

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Qatar: 25 years residency, limited naturalizations.

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Kuwait: 20/15 years residency, Muslim, Arabic fluency.

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Liechtenstein: 30 years residency (5 if married to citizen).

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UAE: 30 years residency (3 for some Arabs, 7 for others).

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Switzerland: 10 years residency with AC permit.

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Relatives required, limited chances without Chinese family.

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