Litvinenko assassination

In 2006, former KGB officer named Alexander Litvinenko died of polonium-210 poisoning in the UK. In 2000, he had fled from court prosecution in Russia and received political asylum in the United Kingdom, where he wrote a book which described Vladimir Putin's rise to power. Initial investigations concluded his death was a state-sponsored assassination orchestrated by Russian security services, but in 2012, newspapers in the UK ran a piece suggesting the existence of an ongoing cover-up by the British Government to bury the case.