 Chechen President Dzhokhar Dudaev was killed by an air strike of the Russian Air Force on April 21, 1996, and Aslan Maskhadov was killed on March 8, 2005.On July 10, 2006, Shamil Basayev, the Chechen rebel, was killed in an explosion, though it is unclear if this was an accident in the handling of explosives, or a targeted Russian attack.In the poisoning of Alexander Litvinenko of 2006, a former KGB officer was murdered in Great Britain by means of the radioactive element polonium-210.