Alexander Litvinenko inquiry opens
Alexander Litvinenko was poisoned by radioactive polonium in 2006 Natasja Weitsz/Getty

An inquiry into the poisoning of Alexander Litvinenko has found that the former Russian spy's assassination was "probably" approved by Russian President Vladimir Putin.

The report, which could have far-reaching repercussions in diplomatic relations between the UK and Russia, also concluded that the two main suspects in the case, Andrei Lugovoi and Dmitry Kovtun, "probably" poisoned Litvinenko by lacing his tea with radioactive polonium-210 at a London hotel.

Presenting the report, inquiry chairman Sir Robert Owen said he is "sure" the two men "knew that they were using a deadly poison and that they intended to kill Mr Litvinenko".