David Miliband and Bernard Kouchner warned that displaced people needed rapid humanitarian aid and urged the full implementation of peace deals.
See a detailed map of the area
In a joint statement, the two European foreign ministers said visiting the area had brought home how necessary it was to end the conflict and improve living conditions for those caught in the middle.
"The immediate needs are obvious. We saw them yesterday," they said.
"The humanitarian needs for food, shelter, water and healthcare must be met through universal provision and secure routes for delivery."
The pair also called for the strengthening of the 17,000-strong UN force in DR Congo, and said bilateral peace agreements already in place between regional powers must be honoured.
Hosted by HE Paul Kagame, President of Rwanda, this is the most important business event to take place in the East Africa region for many years. The theme of this event is 'Trade and Investment Opportunities: East Africa – One Market, One Destination'. It focused upon new opportunities for investment partnerships across East Africa, including Rwanda, Kenya, Tanzania, Uganda and Burundi.
The event provided unparalleled networking opportunities for all attendees; in addition to the main plenary session, specific investors' roundtables were held to discuss infrastructure development, trade and the movement of goods and services, investment climate, accessibility to finance for development in East Africa, among other issues.