Sergei Skripal, a former colonel in Russian military intelligence who betrayed dozens of agents to Britain's MI6 foreign spy service, and his daughter Yulia, were found unconscious on a public bench in the southern city of Salisbury on March 4.
According to British media, police have identified several Russians they say were involved in the attack against former Russian double agent Sergei Skripal and his daughter Yulia.
Two Britons became critically ill after an apparently chance encounter with the poison near the site of the March attack on Sergei and Yulia Skripal.
Sergei Skripal and his daughter were found unconscious following an alleged nerve agent attack in Salisbury in UK in March. Britain blamed Russia for the attack. Moscow retaliated in kind.
Russia's approach to the OPCW came after a British laboratory said it had not proved that Russia manufactured a deadly nerve agent used to poison a former Russian spy.
NATO Secretary-General Jens Stoltenberg said in a statement Moscow's behaviour is "destabilising and dangerous," while allies in the West condemned the nerve agent attack and called on Russia to "address all questions" related to the issue.
Moscow ups ante, warns of reprisals if UK announces sanctions over the poisoning of a former double agent Sergei Skripal and his daughter Yulia on May 4. Russia also says it will bar all British media if UK banned RT broadcaster.
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.
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