What are Russian mercenaries doing in Africa?

There are reported to be tens of thousands of mercenaries belonging to the Wagner Group fighting for Russia in Ukraine. This group has been present in Russian military operations not just in Ukraine but around the world. In Africa, they work in Mali, Mozambique and the Central African Republic. They also have a presence in Sudan where in the last few days fighting between the military and the paramilitary Rapid Support Forces has left almost 200 people dead. In today’s Africa Daily Alan Kasujja has been looking at the Wagner Group and why some African governments have invited them.