What is unclear is the extent of the relationship between the Rwandan president, Paul Kagame, with Mr Nkunda.

ECONOMIST: Violence in Congo

The PM said he would hold "firm" talks with Rwandan President Paul Kagame.

BBC: David Cameron pressed over Rwanda aid money

Meanwhile, Rwandan President Paul Kagame told the BBC that UN troops had "in some cases" made the situation in DR Congo worse.

BBC: M23 rebels attack DR Congo army as UN force deploys

On Monday, Rwandan President Paul Kagame told the BBC that UN troops had "in some cases" made the situation in DR Congo worse.

BBC: World Bank pledges $1bn for DR Congo and neighbours

In London on Thursday, Uganda's President Yoweri Museveni and Rwandan President Paul Kagame agreed to fully support the implementation of the peace process in DR Congo.

BBC: DR Congo town 'volatile'

She has also interviewed a number of African leaders and newsmakers including SA President Jacob Zuma, Rwandan President Paul Kagame, Zimbabwean PM Morgan Tsvangarai, Nigerian Finance Minister Ngozi Okonjo-Iweala, First National Bank CEO Michael Jordaan, Prudential CEO Tidjane Thiam, Econet CEO Strive Masiywa, MTN CEO Sifiso Dabengwa and other business leaders from across the continent.

CNN: About

Rwandan officials and the president himself coolly brush such assertions aside.

ECONOMIST: A Rwandan shooting

Rwandan officials now speak of the Ugandan President, Yoweri Museveni, with open contempt, arguing that he has given extremists in the Ugandan miltiary free reign while also sabotaging the rebellion in Congo by encouraging the fragmentation of the main rebel movements.

BBC: Kisangani's cathedral 'in flames'

Its report, released in mid-April, is extraordinarily detailed, naming Major-General Salim Saleh, the brother of Uganda's president, Yoweri Museveni, among the senior Ugandan and Rwandan commanders whom it accuses of stealing diamonds, gold, coltan (a mineral), timber and ivory.

ECONOMIST: Congo