FAO has warned that the coming weeks would be critical, as farmers will need to prepare land for sowing vegetables in the middle of March.
253 of the casualties were in the Donetsk and Lugansk regions in eastern Ukraine.
The UN says donors are needed to mobilise financial resources, which will be outlined in a few days.
U.S. humanitarian aid in Afghanistan and for Afghan refugees in the region is to total nearly $474 million this year.
The one million dollars contribution would be shared among the vulnerable people in Abuja, Lagos and Kano.
