Sixty killed in dynamite blast at gold mine

At least sixty people have died in a massive explosion in a makeshift mine in Burkina Faso; A Nigerian man based in Kyiv tells us what the atmosphere is like there as Russia moves troops into Ukraine's eastern regions; The President of Botswana makes the case for his country to become the centre of transparency for the diamond industry; And we take look at the Great Green Wall - an African solution to counteract climate change in the Sahel.