Mugabe: The history
Mugabe took power in Zimbabwe in 1980, overseeing the worst episode of hyperinflation and economic collapse ever seen anywhere in the world, the MailOnline reported.
Life expectancy in Zimbabwe dropped from 61 in 1985 to 44 in 2003, according to World Bank figures, largely down to the nation's crumbling economy and widespread poverty.
Life expectancy has since recovered - but is still not as high as it was in the mid-1980s.
Mugabe is widely seen as creating the crisis by breaking up the farms that had provided the back-bone of Zimbabwe's economy, seizing the land from white farm owners and redistributing it to gain political support.
At the height of the crisis in 2009, the UN was feeding seven million Zimbabweans, more than two-thirds of the population.
Yet Mugabe has pledged never to give up the presidency.
He told African Union last year: "I will be there until God says come, but as long as I am alive I will head the country, forward ever, backwards never."
Health scares
Despite his longevity, Mugabe has suffered several health scares.
He repeatedly flies to Singapore and the Middle East for medical treatment - rather than relying on hospitals in his own country.
In 2008 he was diagnosed with prostate cancer - an illness his wife Grace, 52, attributed to "poor diet advised by enemies within the security department".
Dr Tedros Adhanom Ghebreyesus, director-general of the WHO, said: "I am honoured to announce that President Mugabe has agreed to serve as a goodwill ambassador on non-communicable diseases for Africa to influence his peers in his region."
He said: "Zimbabwe [is] a country that places universal health coverage and health promotion at the centre of its policies to provide health care to all."
WHO ambassadors are appointed for an initial period of two years and are unpaid.
Immediate complaints
The British Government immediately complained to the WHO about the decision, warning the appointment could 'overshadow' the organisation's efforts to tackle global health.
The decision is all the more bizarre because the United Nations imposes trade embargoes on arms deals against Zimbabwe.
The UK and EU also have separate financial sanctions against the country, which they say will not be lifted until "progress has been made on democracy, human rights and the rule of law".
A Government spokesman said last night: "President Mugabe's appointment is surprising and disappointing, particularly in light of the current US and EU sanctions against him.
"We have registered our concerns with WHO Director General Dr Tedros Adhanom Ghebreyesus. Although Mugabe will not have an executive role, his appointment risks overshadowing the work undertaken globally by the WHO on non-communicable diseases."
MUGABE'S RECORD IN ZIMBABWE
Mugabe took power in Zimbabwe in 1980, overseeing the worst episode of hyperinflation and economic collapse ever seen anywhere in the world.
Life expectancy in Zimbabwe dropped from 61 in 1985 to 44 in 2003, according to World Bank figures, largely down to the nation's crumbling economy and widespread poverty.
Life expectancy has since recovered to about 60 - but is still not as high as it was in the mid-1980s.
Mugabe is credited as the architect of his country's economic crisis by breaking up the farms that had provided the back-bone of his country's infrastructure, seizing the land from white farm owners and redistributing it to gain political support.
At the height of the crisis in 2009, the UN was feeding seven million Zimbabweans, more than two-thirds of the population. Yet Mugabe has pledged never to give up the presidency.