Britain's Foreign Secretary Boris Johnson has accused Opposotion Leader Jeremy Corbyn of "siding with the Russian spin machine" over the poisoning of a spy in Salisbury.
Corbyn said that Johnson has "serious questions" to answer after saying in an interview a fortnight ago that he had been told by Porton Down scientists that the nerve agent used in the poisoning was made in Russia.
Yesterday scientists from Porton Down said that while they had established that the poison used in Salisbury was the Russian-developed nerve agent Novichok, they could not determine precisely where it was made.
Vladimir Putin, the Russian President, seized on the interview, and the Russian Embassy in the UK subsequently highlighted a deleted Foreign Office tweet claiming scientists had concluded the agent was "produced in Russia".
Corbyn said that Johnson had "egg on his face" and had "completely exceeded the information" he had been given.
Johnson said: "It is lamentable that Jeremy Corbyn is now playing Russia's game of trying to discredit the UK over [the] Salisbury attack.