LONDON, Aug 25 (Reuters) - There is not yet definitive proof that Wagner mercenary boss Yevgeny Prigozhin was onboard a plane that crashed with no survivors earlier this week but it is "highly likely" he is dead, Britain's Ministry of Defence said on Friday. "There is not yet definitive proof that Prigozhin was onboard and he is known to exercise exceptional security measures. However, it is highly likely that he is indeed dead," the British ministry said in a defence intelligence update posted on social media platform X, formerly known as Twitter. "The demise of Prigozhin would almost certainly have a deeply destabilising effect on the Wagner Group. His personal attributes of hyper-activity, exceptional audacity, a drive for results and extreme brutality permeated Wagner and are unlikely to be matched by any successor."

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Persons: Wagner, Yevgeny Prigozhin, Prigozhin, Dimitry Utkin, Valery Chekalov, Kylie MacLellan, Farouq Suleiman, Kate Holton Organizations: Britain's Ministry of Defence, Wagner Group, Thomson Locations: Moscow