Britain warned Russian Federation on Tuesday of a robust response if the Kremlin was behind a mysterious illness that has struck down a former double agent convicted of betraying dozens of spies to British intelligence. oreign Secretary Boris Johnson named Sergei Skripal, once a colonel in Russia's GRU military intelligence service, and his daughter Yulia as the two people who were found unconscious on Sunday on a bench outside a shopping centre in southern England.
However, on Tuesday, the U.S. State Department said it believed that VX was used to assassinate Kim Jong-nam-the brother of North Korea's leader Kim Jong-un-at Kuala Lumpur International Airport past year.
Military personnel have been called in to assist in the investigation.
But the possibility that the nerve agent may have been in Mr Skripal's home would further complicate that search.
Police have cordoned off sites including ex-spy Sergei Skripal's house, a vehicle, the cemetery where his wife is buried, a restaurant and a pub.
Speaking to reporters during a visit to Ethiopia, Lavrov said Russian officials have seen no concrete evidence or "facts" about what happened to Skripal and his daughter. A policeman, Nick Bailey, who attended the pair also suffered poisoning.
Director of nursing Lorna Wilkinson said Mr Bailey was in a serious but stable condition. The agent had been identified but he declined to give any more details about it. The officer - I'm very sorry he's been injured - has actually been to the house, whereas there's a doctor who looked after the patients in the open who hasn't been affected at all. "So there may be some clues floating around in here". Skripal was arrested by the FSB in 2004 on suspicion of betraying dozens of Russian agents to British intelligence.
Sergei spent four years in jail in Russia after he was found guilty in 2006 of being a double agent and divulging Russian secrets to MI6, U.K.'s foreign intelligence service.
However, the Russian FM pointed out that Litvinenko's death, also blamed on Russia, hasn't been fully investigated.
He remained in a serious condition although he is now able to talk, Ms Rudd said.
Britain will respond appropriately if evidence shows Moscow sponsored a nerve agent attack on a Russian ex-spy and his daughter in southern England, Prime Minister Theresa May says in her strongest warning to date.
In a brief written statement, the Organization for the Prohibition of Chemical Weapons says that "the recent report that two people became seriously ill in the United Kingdom as a result of exposure to a nerve agent is a source of great concern".
A Government minister meanwhile revealed that Britain was discussing with its North Atlantic Treaty Organisation allies its potential response should the Salisbury attack be linked by evidence to the Russian state.
"These are the kinds of political and symbolic responses that have an impact on bilateral relations but not on the issue itself", said Boulegue, adding that ties were already so bad that this would be "another drop in an already very full cup".
The hospital reportedly stated that Sergei and Yulia were found unconscious on a bench near a shopping centre in Salisbury on Sunday (March 4) afternoon. A public enquiry published 10 years after the attack said it was carried out by Russian agents, likely acting on the orders of President Putin.
Authorities say there is no risk to the general public from the attack.
"What we see is only news reports. saying that if it is Russian Federation, then a response is going to be given that Russian Federation is going to remember forever".