Following the nerve agent attack in Salisbury on former double agent, Sergei Skripal, 66, and his 33-year-old daughter, Yulia on March 4, some are asking-What is this military grade nerve agent, Novichok?
He said that Russian Federation wanted to work with the British in investigating the agent but that such cooperation was not forthcoming from London.
In an interview with the Mail on Sunday, Russian ambassador Alexander Yakovenko accused Mrs May of using the crisis to improve her image at the expense of relatons with Moscow.
Chizhov pointed out that the United Kingdom chemical weapons research facility, Porton Down, is only eight miles (12 kilometers) from Salisbury.
Security cameras are seen, and a flag flies outside the consular section of Russia's embassy in London, Britain, March 15, 2018. "[It] doesn't give him credit", the ambassador said.
"We insist that Russian Federation has no connection to what happened in Great Britain", Peskov told a conference call. He has been living in Britain for eight years now.
"We have been informed in great detail in recent days by our colleagues in Britain".
Russian Federation has said is open to cooperation with Britain, but has refused Britain's demands to explain how Novichok, a nerve agent developed by the Soviet military, was used against the Skripals.
Russia's ambassador to London has suggested the Government is using the Salisbury poisoning case to divert attention from Brexit.
"In 1992, then president Boris Yeltsin signed a decree stopping production".
"We ended all research in the sphere of new military toxic agents after joining the (Chemical Weapons) Convention, and previous year... all stockpiles of toxic agents were destroyed", said Ryabkov.
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His comments came ahead of the arrival in London of experts from the chemical weapons watchdog on Monday.
"The major reason the "Russians" were suspected was because it was novichok-which most in the West do not know about and the counteragent for nerve agent exposure Pralidoxime is useless to Novichok".
Lavrov said Russia's response would come "very soon" but be conveyed to British officials first, an apparent contradiction of an earlier report by state news agency RIA that said Lavrov had promised to expel British diplomats. "I don't have evidence of anything being used".
The British Foreign Office offered its own harsh words.
Johnson accused the Russians of "smug sarcasm and denial" in response to the accusations, and said the global community was behind Britain.
It ordered the diplomats to leave within a week.
Over the weekend, the Russian foreign ministry announced it would expel 23 British diplomats from Moscow in response to London's decision to expel 23 Russian diplomats.
Moscow denies any involvement and is expected to retaliate.
"We will never tolerate a threat to the life of British citizens and others on British soil from the Russian government", she said, prompting applause.
"The first thing that comes to my mind is that should it really be a warfare agent, people would have died instantly".
British police are not linking his case with the Salisbury attack.
Russian ex-spy Sergei Skripal, 66, and his daughter Yulia Skripal, 33, remain critically ill in hospital, after they were found unconscious on a bench in Salisbury, Wiltshire.
Labour leader Jeremy Corbyn, whose response to the attack has led to criticism from some on his backbenches, said "the evidence points towards Russia" being responsible - but the possibility of gangsters being behind the attack rather than the Kremlin could not be excluded.