South Africa's ailing anti-apartheid hero Nelson Mandela is doing much better in hospital, his ex-wife Winnie said on Friday before a visit by US President Barack Obama that will include a personal homage to the globally admired statesman.
The faltering health of the first black president of South Africa, a revered symbol of racial reconciliation, has drawn world attention since the 94-year-old was rushed to hospital with a recurring lung infection nearly three weeks ago.
Earlier this week, the government reported Mandela's frail condition had turned critical, but since Thursday President Jacob Zuma has reported that his health is improving.
"I'm not a doctor, but I can say that from what he was a few days ago, there is great improvement," Mandela's ex-wife, Winnie Madikizela-Mandela, told reporters outside Mandela's former home in the Johannesburg township of Soweto.
But, she added, he remained "clinically unwell".
Heading for Johannesburg aboard Air Force One from Senegal, Obama paid tribute to Mandela for the way he led South Africa out of apartheid after years of struggle, but he said he did not need a "photo op" with the former president.
During his weekend trip to Johannesburg, Pretoria and Cape Town, his second stop of a three-nation Africa tour, Obama is scheduled to visit Robben Island, where Mandela passed 18 of the 27 years he spent in apartheid prisons.
White House officials have said they will defer to the Mandela family on whether a visit to the hospital to see Madiba, as he is affectionately known, would be appropriate.
While well-wishers and journalists crowded outside the hospital in the capital Pretoria where Mandela is being treated, a few blocks away, hundreds of demonstrators protested against Obama's visit, some burning US flags.
Nearly 1,000 trade unionists, Muslim activists and South African Communist Party members marched to the US Embassy shouting slogans denouncing Obama's foreign policy as "arrogant and oppressive".
Muslim activists held prayers in a car park outside the embassy. Leader Imam Sayeed Mohammed told the group: "We hope that Mandela feels better and that Obama can learn from him."