Some 26 million people are "facing extreme hunger" in Kenya, Ethiopia and Somalia, warns humanitarian organisation Oxfam.
Aid groups and MPs have raised concerns over the move to prioritise defence spending over aid.
The deal came as part of the president's state visit to the UK - the first by a west African leader in 37 years.
President Idris Mahamat Déby orders the military to be on high alert and a "total closure" of the border.
Caf executive committee member Augustin Senghor says the decision to strip Senegal of the 2025 Afcon title is "unacceptable, abject and we have to denounce it".
The conflict has persisted despite a peace deal signed by DR Congo and Rwanda in December.
Residents of some areas have been without mains water for weeks.
Hunting for the horns and meat, Ugandan poachers once wiped out the southern white rhinos from the country.
BBC Sport journalists and pundits look at what happened at the chaotic Afcon final, and what comes next.
Moroccans feel justice has been done but the Senegalese are angry after being stripped of the title.
Our Ask Me Anything team look at why the 2025 Afcon final result has been overturned - and what it means.
The Senegalese government calls for an "independent international investigation" at the Confederation of African Football after it stripped Senegal of the Africa Cup of Nations title.
King Charles and senior royals will provide a ceremonial welcome for Nigeria's President Tinubu on his state visit.
Zhang Kequn was found with the large consignment of ants in his luggage at a Nairobi airport.
Morocco declared the winners of the 2025 Africa Cup of Nations after the Confederation of African Football overturns the result of their final defeat to Senegal.
Etienne Davignon, a 93-year-old ex-diplomat, is accused of involvement in the assassination of the independence hero.
These reports harm attempts to close the wide gender representation gap in Zambia, activists say.
Multiple blasts struck some of the Maiduguri's busiest locations on Monday evening.
Some 50,000 people are told to flee their homes as the army warns of a huge military offensive in Jonglei state.
Fifa fines the Nigeria Football Federation and DR Congo Football Association for separate disciplinary breaches by supporters.
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