Russian authorities have denied any involvement in all cases

We have seen the worst of Russia in this saga - now we must both hope for the best

Government urged to respond to state-sanctioned killing of British citizen in London in 2006

Given it’s been almost 10 years since the last British person dared drink a cup of tea, the war is already lost

Mr Putin remained close to his former deputy at the FSB intelligence agency, Nikolai Patrushev, after moving into politics in 1999

Marina Livinenko demanded the expulsion of all Russian intelligence agents from Britain along with economic sanctions

With the spotlight so narrowly on Litvinenko and his death, there was no room for any real consideration, or even curiosity - at least none that reached the public domain - about how the polonium arrived in the UK

David Cameron and Vladimir Putin agreed to 'work together' to defeat Isis last month

Sir Robert Owen’s report found that the operation was likely to have been directed by the FSB

It has been revealed that President Vladimir Putin "probably" approved the assassination of Alexander Litvinenko

A former spy, proud British citizen and relentless critic of the Kremlin

As the report into the public inquiry into the former Russian spy's murder is published, we look back at the timeline up until now