LONDON — A group of investigative journalists from Britain and Russia on Wednesday named a highly decorated colonel in Russia’s military intelligence service as one of the men accused of poisoning a former Russian spy and his daughter in Britain earlier this year.

A report by the investigative group Bellingcat and the Insider, a Russian news outlet, named the suspect as Col. Anatoly V. Chepiga, a 2014 recipient of the title Hero of the Russian Federation, probably for service in eastern Ukraine. The award, given to only a handful of officers each year, is typically bestowed personally by President Vladimir V. Putin, the report said.

The police in Britain would not comment on the report, and Russia also offered no response.

Moscow has denied any involvement in the attack on the former spy, Sergei V. Skripal, who was living in the English city of Salisbury after being released from a Russian prison in a spy swap.

The two men Britain identified as the prime suspects have told the Russian news media that they were merely sports nutritionists who had visited Salisbury to see the sights and scout for new nutrition products.