The man, who used the alias Alexander Petrov to travel to the United Kingdom, was unmasked as a trained military doctor employed by the GRU - Russia's military intelligence agency.
A still image taken from a video footage and released by RT global news channel on September 13, 2018, shows two Russian men with the same names, Alexander Petrov and Ruslan Boshirov, as those accused by Britain over the case of former Russian spy Sergei Skripal and his daughter Yulia, during an interview at an unidentified location, Russia.
The revelation comes less than two week after his alleged accomplice was named as Colonel Anatoliy Chepiga - said to be a more senior officer who has received Russia's highest military award.
The two suspects had traveled from Russian Federation to London by plane and then visited Salisbury by train on two successive days including the day the attack happened.
Mishkin had travelled to the United Kingdom under the name of Alexander Petrov.
It said that Mishkin was born in 1979 in the Archangelsk region in Northern European Russia and was trained as a military doctor for the Russian naval armed forces at one of Russia's elite military medical schools.
Britain last month charged two Russian men with the poisoning. But the nerve agent killed a British woman, Dawn Sturgess, and seriously sickened her partner. They said they went to the city to visit its cathedral.
Anatoliy Chepiga AKA Ruslan Boshirov and Alexander Mishkin AKA Alexander Petrov.
Russian President Vladimir Putin has said that the two men shown in British surveillance footage near Skripal's home in Salisbury and identified by British authorities as Boshirov and Petrov were actually civilians on a tourist trip.
British police have said they think the couple was exposed to the substance in June from traces in the bottle that had contained the Novichok used to poison the Skripals months earlier.
British, Dutch and USA officials have accused the GRU of trying to hack the computers of worldwide agencies, masterminding a devastating 2017 cyberattack on Ukraine and being behind stolen emails that roiled the 2016 US presidential election.
The prosecutors said at the time the two were undercover GRU officers.
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