Former presidents and protestors recount two key moments in the history of the Ukraine crisis - from the historic meeting that ended the USSR to the dramatic anti-government protests in Ukraine in 2013-14. And the BBC's Lucy Ash explains how Russian-Ukrainian relations have evolved.
Also in the programme, an eyewitness account of the forgotten mass killings in Burundi in 1972, plus the inventors of Google Maps and how Manolo Blahnik became a legend in the world of shoes.

Photo: Kyiv, Ukraine - December 9th 2013. Anti-government protesters stand guard at one of the barricades defending Maidan Square against police. Credit: Etienne De Malglaive/Getty Images