The president says it will speed up integration into East Africa, seen as crucial for boosting trade.
Ethiopia has written to the UN, accusing Eritrea of "funding, mobilizing and directing armed groups" on its soil.
The security minister says the NGO "collected and passed on sensitive security information" - which it denies.
The forgery allegations have sparked outrage among some Nigerians, following a newspaper exposé.
Abu Agila Mas'ud Kheir al-Marimi is said to have admitted his role in the murder of 270 people in the 1988 bombing.
The government says the charity African Parks displayed an arrogant and disrespectful attitude.
Nigerian Modernism at the Tate spotlights a compelling period in the West African country's history.
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