Britain intends to request the extradition of two Russian agents believed to have been involved in the Novichok poisoning of a Russian former double agent and his daughter in England earlier this year, according to the Guardian newspaper.
The British investigation earlier reported that two of the alleged poisoner had to flee to Russian Federation. Russian Federation has repeatedly denied any involvement in the attack.
An investigation by hundreds of British police and intelligence officers have pieced together the movements of the two Russians, from their entry into Britain through to their departure, the Guardian reported.
The government has been consistent in pointing the finger of blame at Moscow for the poisoning using Novichok - a military-grade nerve agent developed by the former Soviet Union.
In 2007, after Russian ex-spy Alexander Litvinenko was murdered with polonium in London, Moscow refused Britain's request to extradite two Russian suspects in the case.More news: West Nile-infected mosquitoes found in Wyoming
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"This is Litvinenko all over again".
British police believe Charlie Rowley, a local man who became sick after exposure to the nerve agent in June, later found the bottle used to smear Novichok on the Skripal's door handle in the southern English town of Salisbury.
But it says that an extradition request is expected to be rejected by Russian Federation. The Russian Constitution forbids the extradition of Russian citizens to another state. One died days afterwards.
After the attack on the Skripals, allies in Europe, the United States and elsewhere expressed support for Britain and concern over the incident by ordering the biggest expulsion of Russian diplomats since the height of the Cold War.
Russian Federation retaliated by expelling an equal number of Western diplomats. Police are working on the assumption that the bottle was dropped somewhere in the city, where it was later picked up by Rowley, who gave it to Sturgess.