A spokesman for Zimbabwean President Robert Mugabe has rejected Western criticism of the country's disputed presidential run-off election. At an African Union summit in Egypt, George Charamba said the West had no basis to speak about the situation - and can "go hang a thousand times". Zanu-PF's Robert Mugabe said he had won the vote, boycotted by the opposition. The opposition MDC said Friday's one-man election had killed off any prospect of a negotiated settlement. Tendai Biti, the Movement for Democratic Change's secretary-general who faces treason charges in Zimbabwe, said the country's "sham election" last week "totally and completely exterminated any prospect of a negotiated settlement". He denied any negotiations were going on between the two parties, or that an agreement was in the offing. "There are recent widespread reports that Zanu-PF and MDC are talking and are about to conclude an agreement to form a government of national unity," said Mr Biti. "Nothing could be as malicious and as further from the truth." The run-off was widely criticised by Western leaders as not being free or fair. 'Evolving dialogue' Earlier, opposition leader Morgan Tsvangirai left the Dutch embassy in Harare, where he had taken refuge after pulling out of Friday's vote because of election violence. He had decided the situation was calm enough to return home, the Dutch foreign ministry official said. Mr Tsvangirai's Movement for Democratic Change (MDC) says he won the presidential election outright in March, but government officials said he did not secure enough votes to avoid a run-off. Briefing reporters on the fringes of the Sharm el-Sheikh summit, Mr Charamba was asked whether Zimbabwe should follow Kenya and create a government of national unity. "Kenya is Kenya. Zimbabwe is Zimbabwe," he responded. "We have our own history of evolving dialogue and resolving political impasses the Zimbabwean way. The Zimbabwean way, not the Kenyan way. Not at all." Mr Mugabe is expected to address the AU summit in Sharm el-Sheikh later on Tuesday. 'Denied rights' African leaders attending the summit have faced growing pressure to take a strong stand against Zimbabwe's president. Sierra Leonean President Ernest Koroma told the BBC he strongly condemned Zimbabwe's flawed electoral process. "We believe the people of Zimbabwe have been denied their democratic rights," he said. Mr Koroma expressed support for a South African initiative to encourage the formation of a transitional government of national unity. "We would urge the South African group to ensure they engage both parties to form a transitional government that prepares Zimbabwe for fresh elections." Kenyan Prime Minister Raila Odinga urged the AU to suspend Mr Mugabe until he allowed free and fair elections. But Africa's longest serving leader, Gabon President Omar Bongo, said Mr Mugabe should be accepted as the country's elected president. Botswana's Foreign Minister Phandu Skelemani suggested an interim national unity government could pave the way for new elections. "We think there should be a way forward where both Mugabe and Tsvangirai will be brought together so that they can talk and hopefully form a government of national unity which will be understood to be interim and to prepare for elections," he said.