Conflict in eastern DRC: why has the security crisis worsened?

On October 29, the M23 rebels took control of Kiwanja and Rutshuru-centre, major strategic cities in the province of North Kivu, located about forty kilometers from the city of Goma.
Kenya will deploy a contingent as part of a regional peacekeeping force in eastern Democratic Republic of Congo. Kenyan troops will help halt the advance of the M23 rebels.