The second suspect in the Salisbury poisoning case was a doctor and highly decorated Russian military intelligence officer, an investigative website says.

Bellingcat said it used a combination of online material and leaked documents to identify Alexander Mishkin, 39, as a person linked to the attack in March.

It said President Vladimir Putin had presented him with the Hero of the Russian Federation award in 2014.

When asked about the naming of Dr Mishkin, the Kremlin would not comment.

Last month, Bellingcat named the first suspect as Anatoliy Chepiga, a claim also rejected by Russia which says it was not prepared to discuss reports or media articles on the case.

At a news conference held in the Houses of Parliament on Tuesday, Bellingcat investigator Cristo Grozev said Dr Mishkin - like Mr Chepiga - was a member of the GRU and given the celebrated award for "actions in Ukraine".

He said Dr Mishkin's grandmother has a photograph that has "been seen by everybody in the village" of President Putin shaking his hand and giving him the award.

The BBC has contacted two people who knew Dr Mishkin as a child in Loyga in the north of Russia, and they confirmed from photographs that he was the man seen in images released by police after the Salisbury attack.

Bellingcat, a UK-based website, said both Dr Mishkin's real passport and the false passport he travelled to the UK on in the name of Alexander Petrov carried the same date of birth.

Outlining in detail how it identified the Salisbury suspect as Dr Mishkin, Bellingcat said it had pieced together his identity using various databases online, including telephone and car insurance records, and later obtained copies of his passport and driving licence.

It also used social media to contact hundreds of people who may have been at military academy with Dr Mishkin.

Most people did not respond to the inquiry but one, who requested complete anonymity, said they had recognised Dr Mishkin as the suspect who was interviewed under the name of Alexander Petrov by the RT television channel.

Mr Grozev said: "That person told us everybody from his class, his department, was contacted two weeks ago and told not to talk to the media."

Bellingcat said Dr Mishkin completed his medical studies at a faculty which trains doctors for Russia's naval armed forces and around the same period was recruited by the GRU.

It said he made several trips to Ukraine, including during the 2013-14 unrest.

What has been happening in Ukraine?
In spring 2014 mass demonstrations in central Kiev over the government's decision to suspend the signing of an association agreement with the EU ended in bloodshed and the ousting of pro-Moscow President Viktor Yanukovych.

Soon afterwards Russian troops annexed the Ukrainian territory of Crimea, and unrest broke out in mainly Russian-speaking eastern areas of the country.

The unrest became a full-scale insurgency, and rebels seized large swathes of territory. Since then, thousands of people have died in fighting between the rebels and Ukrainian government forces.

Moscow denies sending regular troops and heavy weapons to the separatists, but admits that Russian "volunteers" are helping the rebels.

How are the suspects linked to the Salisbury poisoning?
Former GRU officer Sergei Skripal - who sold secrets to MI6 - and his daughter Yulia survived being poisoned with Novichok on 4 March.

The attack left Mr Skripal and Yulia critically ill, but Dawn Sturgess, 44, was later exposed to the same nerve agent and died in hospital.

London's Metropolitan Police and the Crown Prosecution Service said last month that there was enough evidence to charge Dr Mishkin and Mr Chepiga with attempted murder over the Salisbury attack.

Detectives said the pair arrived in the UK using passports bearing the names Alexander Petrov and Ruslan Boshirov on 2 March, although they had said it was likely the men were travelling under aliases.

The movements of the suspects, who are alleged to have smeared Novichok on a door handle of Mr Skripal's home, were captured in a series of CCTV images that were released by police.

The event sparked a series of accusations and denials between the UK and Russian governments, culminating in diplomatic expulsions and international sanctions.