Relations between the United Kingdom and Russian Federation are at the worst they have been since the end of the Cold War after the nerve agent attack on Sergei Skripal, a former spy, and his daughter Yulia.
An unnamed government source told The Guardian: "The CPS has been asked to prepare extradition requests and we understand they are ready to go".
Last night Government sources pledged to do everything possible to secure a conviction for the Skripal family after Sergei and his daughter Yulia were targeted in a nerve agent attack in March which prompted deep recriminations around the world.
Moscow has categorically denied all accusations over the novichok attacks.
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.
Any extradition request is likely to be rejected by Russian Federation - and risks inflaming diplomatic tensions between London and Moscow, which are the worst since the Cold War.
Two Russians are said to have been identified as suspects in the attack which left one person dead and three injured.
"This is Litvinenko all over again". The police have managed to identify the people coming over and going back again'.
The Skripal incident occurred in March, when the former colonel in Russian military intelligence who betrayed dozens of agents to Britain's MI6 intelligence service and his daughter were found unconscious on a public bench in Salisbury. The Russian constitution prevents the extradition of Russian citizens to another state.
The Skripals were hospitalized for months in critical condition, but after what they described as a painful period of recovery, both were released.
Russian officials refused to hand over suspects in the murder case of Alexander Litvinenko.
Russian Federation retaliated by expelling an equal number of Western diplomats.
Charlie Rowley and Dawn Sturgess were subsequently treated for exposure to the nerve agent.