The military commander of the M23 rebels is reported to have joined negotiations to end the fighting in the Democratic Republic of Congo.
Sultani Makenga has flown to the Ugandan capital, Kampala, a rebel spokesman said.
The militia is refusing to end its occupation of the eastern city of Goma, hours before the expiry of a deadline for them to leave.
A regional summit at the weekend told the rebels to leave Goma by Monday.
Lord Malloch-Brown, former Foreign Office minister, and Ian Birrell, journalist and former deputy editor of the Independent, discussed the role that the outside world should play when it comes to the Democratic Republic of Congo.
"One of the big issues to resolve is what on earth is the point in having a UN peacekeeping mission which doesn't keep the peace and doesn't do anything what so ever," Mr Birrell explained.
"We share a fair degree of responsibility" for the brutality because of the UK's financial backing of Rwanda, he added.
Lord Malloch-Brown told Today presenter Justin Webb that this conflict will "never be solved by foreign policing".
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