Newly disclosed papers show that the Foreign Office advised against British military action to overthrow the then Zimbabwean president, the long-serving leader, in 2004, advising it was not considered a "viable option".
Internal documents from Tony Blair's government show officials weighed up options on how best to handle the "remarkably robust" 80-year-old leader, who refused to step down as the country descended into turmoil and financial collapse.
Following the ruling party winning a 2005 election, and a year after the UK joined a US-led coalition to oust Iraqi leader Saddam Hussein, No 10 asked the Foreign Office in July 2004 to produce potential courses of action.
Diplomats concluded that the UK's strategy to isolate Mugabe and forging an international consensus for change was failing, having failed to secure support from influential African states, notably the then South African president, Thabo Mbeki.
Courses considered in the documents were:
"We know from Afghanistan, Iraq and Yugoslavia that changing a government and/or its harmful policies is exceedingly difficult from the outside."
The diplomatic assessment rejected military action as not a "serious option," adding that "The only candidate for leading such a armed intervention is the UK. No other country (even the US) would be prepared to do so".
It cautioned that military involvement would cause significant losses and have "considerable implications" for UK nationals in Zimbabwe.
"Short of a major humanitarian and political catastrophe – resulting in widespread bloodshed, significant exodus of refugees, and regional instability – we judge that no nation in Africa would support any attempts to remove Mugabe forcibly."
The paper adds: "We also believe that any other international ally (including the US) would sanction or participate in military intervention. And there would be no jurisdictional basis for doing so, without an approving Security Council Resolution, which we would fail to obtain."
The Prime Minister's advisor, a senior official, advised Blair that Zimbabwe "will be a real spoiler" to his plan to use the UK's presidency of the G8 to make 2005 "the year of Africa". The adviser stated that as military action had been ruled out, "it is likely necessary that we must play the longer game" and re-engage with Mugabe.
Blair appeared to agree, writing: "We should work out a way of exposing the falsehoods and misconduct of Mugabe and Zanu-PF up to this election and then subsequently, we could try to re-engage on the basis of a clear understanding."
The then outgoing ambassador, in his valedictory telegram, had recommended critical re-engagement with Mugabe, though he recognized the Prime Minister "would likely be appalled given all that Mugabe has uttered and perpetrated".
The Zimbabwean leader was ultimately removed in a 2017 coup, aged 93. Previous claims that in the early 2000s Blair had tried to pressurise Thabo Mbeki into joining a armed alliance to depose Mugabe were strongly denied by the ex-British leader.
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