LUANDA (Reuters) - The leaders of Namibia and the Democratic Republic of the Congo were due to meet their Angolan counterpart on Tuesday to discuss the political situation in the oil and diamond-rich southern African country. National radio said Laurent Kabila and Sam Nujoma would meet Angolan President Eduardo dos Santos for talks about the political situation and the peace process in Angola. African diplomats in South Africa said the leaders would review Angola`s failing peace accord signed in Lusaka in 1994. The United Nations has largely blamed the opposition UNITA group led by Jonas Savimbi for failure to implement the accords. Kabila is a close ally of Angola and analysts say Nujoma is respected by both the Angolan government and UNITA. Savimbi has repeatedly stalled the implementation of the U.N.-backed Lusaka peace accords and the Angolan government says fighting had recently flared up between its troops and UNITA in the remote countryside. The U.N. Security Council has imposed sanctions to force UNITA into compliance with the peace accords but with little success.