He added it was the first time that funds were released from one of OCHA’s regional funds.
Borno, Adamawa and Yobe are the focal states to benefit from the funds.
The UN on Thursday launched a $1 billion appeal for Türkiye to assist more than five million people affected by the cataclysmic earthquakes.
Mr Antonio Guterres said that a similar appeal is being finalised for survivors across the border in Türkiye.
The M23 militia began as a renegade force of army mutineers in 2012, committing atrocities and war crimes.
The UN estimated that heavy flooding affected more than 800,000 South Sudanese in 2021.
