Relations between London and Moscow have crashed to a post-Cold War low after an attack on an ex-Russian spy, the first known offensive use of a nerve agent in Europe since World War Two.
The move is in reaction to Britian's earlier decision to expel 23 diplomats over the alleged use of a nerve agent against a former Russian military intelligence officer who worked for British intelligence.
Ties between the two countries deteriorate rapidly in the 10 days since Russian ex-spy Sergei Skripal and his daughter Yulia were attacked with a nerve agent in Salisbury, southwest England.
Russia says it won't respond to Britain's calls to explain its role in the UK spy poisoning attack until it receives samples of the chemical at the centre of the incident.
Prime Minister Theresa May said it is "highly likely" that Moscow was responsible for the poisoning of former Russian double agent Sergei Skripal and his daughter. Russia called May's statement a "circus show."
British authorities vow to respond appropriately if foreign state involvement is found to be at play in the suspected murder attempt on former Russian spy Sergei Skripal and his daughter Yulia, who fell critically ill on March 4.
Sergei Skripal, who passed Russian secrets to Britain, and his daughter Yulia, have been in intensive care since they were found slumped unconscious on a bench last week in Salisbury.
Sergei Skripal, once a colonel in Russia's GRU military intelligence service, and his 33-year-old daughter, Yulia, were found slumped unconscious on a bench outside a shopping centre in the southern English city of Salisbury on Sunday afternoon.
An attack on April 4 in Khan Sheikhoun in northern Idlib province killed dozens of people, prompting a US missile strike against a Syrian air base.
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