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The Government ramped up pressure on Russia yesterday by announcing a public inquiry into the poisoning of former KGB officer Alexander Litvinenko.
Mr Litvinenko's death nearly eight years ago has been a source of diplomatic tension between Whitehall and the Kremlin ever since...
Alexander Litvinenko joins other former FSB officers to claim in Moscow that they had received orders to kill Boris Berezovsky.
Litvinenko flees after being jailed for abuse of office.
After years of criticising the Russian leadership from safety in Britain, he meets Dmitri Kovtun and Andrei Lugovoi at a London hotel.
Litvinenko dies in intensive care from radiation poisoning.
The CPS says that Mr Lugovoi should be charged with the murder.
Russia refuses to extradite Mr Lugovoi.
An inquest into the death is delayed as the coroner calls for a public inquiry – a demand rejected by the Government.
The High Court tells Theresa May to reconsider her decision on holding a public inquiry after a legal challenge by Litvinenko’s widow.
Malaysia Airlines flight MH17 shot down in Ukraine.
Theresa May announces public inquiry into the death of Litvinenko – after the Government pushes European nations to ramp up sanctions against the Putin regime over the disaster.