Why are Russian mercenaries in the CAR?

What is Russia's game plan in the Central African Republic? A private military firm from Russia has been hired to help defend the country. But, in recent months, UN experts have accused the company of various human rights abuses. So, what exactly are they doing there? And why?Host: Alan Kasujja (@Kasujja on Twitter) Guest: Beverly Ochieng, BBC Monitoring#AfricaDaily