British Prime Minister Theresa May on Monday said it was "highly likely" that Moscow was responsible for the poisoning of a former Russian spy who was attacked with a nerve agent near his home in southern England last week.
"Should there be no credible response, we will conclude that this action amounts to an unlawful use of force by the Russian state against the United Kingdom," she said.
Sixty-six-year-old retired military intelligence officer Skripal and his 33-year-old daughter were found unconscious on a bench in Salisbury city centre on March 5.
"It is a circus in the British parliament. The conclusion is obvious: it is another informational and political campaign based on a provocation," Zakharova said.
Skripal, who is a retired Russian military intelligence officer, was jailed for 13 years by Russia in 2006 for spying for Britain.
Russia said Skripal had been paid $100,000 for the information, which he had been supplying from the 1990s.
Skripal and the woman are both presently in intensive care at the Salisbury District Hospital.
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