“We have certainly heard the ultimatum voiced in London,” Russia's top diplomat Sergey Lavrov said.
“The spokesperson for the Foreign Ministry has commented on our attitude to this,” he added referring to Maria Zakharova branding of May’s appearance in Parliament as a “circus.”
"One does not give 24 hours notice to a nuclear power" adding that the "Skripal poisoning was not an incident but a colossal international provocation."
In a fresh sign of the escalating diplomatic tension sparked by the case, the Russian Embassy cautioned against "such a reckless move".
The Government has not publicly disclosed the options under consideration but reports on Tuesday suggested one possibility was a cyber counter-attack.
Responding to the speculation, the Russian Embassy in the UK said: "Statements by a number of MPs, 'Whitehall sources' and 'experts' regarding a possible 'deployment' of 'offensive cyber-capabilities' cause serious concern.
"Not only is Russia groundlessly and provocatively accused of the Salisbury incident, but apparently, plans are being developed in the UK to strike Russia with cyber weapons.
"Judging by the statements of the Prime Minister, such a decision can be taken at tomorrow's meeting of the National Security Council.
"We invite the British side to once again consider the consequences of such a reckless move."
"No one knows anything, including Theresa May, who has no actual fact in her hands," Zakharova told the 60 Minutes program on the Rossiya-1 television channel.
"...not a single British media outlet with work in Russia if London shuts RT."