Britain's domestic Press Association news agency reported last month that police had identified two Russian suspects in the Salisbury attack, but there has been no official confirmation of this.
While the request is nearly certain to be rejected out of hand by the Russian authorities, it is likely to reignite the bitter diplomatic row that erupted following the poisoning of the former Russian spy in March.
United Kingdom government ministers vowed to exert "international pressure" to force Russian Federation into doing "the right thing", The Telegraph reported Monday.
Theresa May has been consistent in pointing the finger of blame at Moscow for the poisoning of the Skripals using Novichok, a military-grade nerve agent developed by the former Soviet Union.
Months later, a 44-year-old woman and a 45-year-old man, both British nationals, were also found poisoned, probably after accidentally coming into contact with a container used in the attack on the Skripals.
Speaking to The Guardian, a Whitehall source said: "The CPS has been asked to prepare extradition requests and we understand they are ready to go". The diplomatic dispute escalated shortly after the Skipals' poisoning, with Britain and its allies expelling more than a hundred Russian diplomats in protest. "It's nearly a rerun of the situation", The Guardian quoted a government source as saying.
Whitehall sources told the paper that authorities had identified two people they were ready to put on trial. Moscow refused to extradite Russians in accordance with the Constitution.
Mr Rowley recovered from the attack but Ms Sturgess, his partner, died. Later, Sturgess died in the hospital, the other victims were discharged after treatment. 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.