Africa News Tonight: Presidents Macky Sall of Senegal and Cyril Ramaphosa of South Africa are heading a delegation that is visiting Kyiv today and St. Petersburg tomorrow to press for an end to the Russia-Ukraine conflict. Mali's military is holding a referendum on a new constitution Sunday, a key step toward a return to constitutional rule and a presidential election expected next year in the West African country. And, The World Food Program is scaling up food aid to support 5.9 million people across Sudan over the next six months as hunger rises in the war-torn country. For this and more, stay tuned to Africa News Tonight!