DRC conflict: Why is fighting intensifying and can it threaten regional stability?

KINSHASA, Feb 19 (Reuters) - Violent clashes have escalated between Democratic Republic of Congo (DRC)'s army and Rwandan-backed M23 Tutsi-led rebels in eastern Congo, killing scores and displacing hundreds of thousands.

The fighting, in a war that has lasted decades, has increased the risk of an all-out conflict between Congo and Rwanda that could suck …