Eastern Democratic Republic of Congo has been in a state of conflict since the late 1990s. The Rwandan-backed M23--which has been making gains after taking control of major cities in the east. The two sides were due to meet in Angola on Tuesday. But M23 rebels withdrew- blaming new EU sanctions for their decision. Instead the Congolese and Rwandan presidents, Felix Tshisekedi and Paul Kagame met for talks in Doha. The leaders called for an immediate ceasefire in eastern DRC. So, what does all this mean for the conflict?