Alexander Litvinenko was a former Russian security service officer who died in London in 2006 after being poisoned with polonium-210. He had been an outspoken critic of the Russian government and its security services, and his death sparked an international scandal.

Litvinenko had served in the Russian Federal Security Service (FSB) and the Federal Protective Service (FSO). He was also a former member of the Russian military intelligence agency, the GRU. In 1998, Lit