Analysts say the deadly march by Rwanda-backed rebels across eastern Congo could widen into a regional conflict drawing in even more countries, and two neighboring nations with the most involvement in the mineral-rich area might be the key to stopping the violence.

Rwanda-backed rebels who have captured eastern Congo’s largest city say they plan to take their rebellion to the capital and seek to gain political power.

Condemnation has grown over Rwanda's military backing of the insurgency by M23 rebels in eastern Congo, near the border between the two nations. President Paul Kagame has become increasingly isolated and,