Russia has no chemical weapons stockpiles and was not behind the poisoning of former intelligence officer Sergei Skripal and his daughter Yulia, Russian Envoy to the EU Vladimir Chizhov stated while talking to the BBC's Andrew Marr on his Sunday show.
Writing in the Sun on Sunday two weeks after the March 4 incident which has left the Skripals in critical conditions, Mr Johnson said of Saturday's expulsions: "These futile measures will only punish ordinary Russians by depriving them of harmless opportunities to learn English and apply for United Kingdom visas".
They were invited by the Government last week to verify analysis of the nerve agent used in the 4 March attack in Salisbury.
Russia's ambassador to the European Union was accused of talking "nonsense" today after he claimed the nerve agent used against an ex-spy could have come from a British laboratory.
The samples will be sent to "highly reputable worldwide laboratories" selected by the OPCW for testing.
"And if you look at the media, the attack is being exploited to undermine the popularity of Mr Putin and the prospects of the FIFA World Cup in Russian Federation".
"It's complete drivel, rubbish, nonsense that somebody in Russian Federation would allow themselves to do such a thing ahead of elections and the World Cup", Putin told supporters after winning a fourth term as president.
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"Russia had nothing to do with it", Chizhov told the BBC.
In Moscow on Sunday, in his first extensive remarks about the poisoning, President Vladimir Putin called it "total rubbish, drivel and nonsense" to think that someone in Russian Federation would carry out such "antics" so close to Russia's presidential election, which was Sunday, and the World Cup soccer tournament, which begins in June.
She said: "But Russia's response doesn't change the facts of the matter - the attempted assassination of two people on British soil for which there is no alternative conclusion other than that the Russian state was culpable".
At the same time, Putin, who won another six-year term in Sunday's election, said that Moscow is open for taking part in the probe together with Britain.
Speaking on The Andrew Marr Show on Sunday, he said: "We had evidence within the last 10 years, Russian Federation has not only investigating the delivery of nerve agents for the purposes of assassinations but has been creating and stockpiling Novichok".
"When you have a nerve agent or whatever, you check it against certain samples that you retain in your laboratories".
"And part of this programme has involved producing and stockpiling quantities of Novichok", a statement said.
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He told ITV's Peston on Sunday: "We support exactly what the prime minister said and we condemn Russian Federation for this, condemn them".
Russia's ambassador to the EU, Vladimir Chizhov, suggested the nerve agent may have come from the Porton Down laboratory, which is about eight miles from Salisbury.
Asked whether he was saying Porton Down was responsible, Chizhov replied: "I don't know".
Following Moscow's tit-for-tat response to the UK's expulsion of 23 Russian diplomats and threats of "further retaliatory measures" should Britain take additional action, it is clear there needs to be a united global front in dealing with this matter.
Mr Johnson called the accusation "satirical", adding it was "not the response of a country that really believes itself it to be innocent".
Western powers see the poisoning of the Skripals as the latest sign of increasingly aggressive Russian interference in foreign countries.
Johnson said Britain's National Security Council will meet later this week to decide "what further measures, if any" may be taken, and that the government may decide to target Russian wealth in Britain.
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Russia's central election commission also said its website was the target of an unsuccessful hacking attempt during the elections. British officials have said Moscow was culpable for the poisoning and expelled 23 Russian diplomats based in London.
The spy dispute has sent U.K. -Russia relations to Cold War-levels of tension.