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Three images provided by Bellingcat of Alexander Mishkin.
The Russian authorities have denied any involvement in the poisoning, and days after the charges were filed, the two suspects gave an interview to Russian state television in which they claimed to be sports nutritionists.
The other suspect in the March nerve agent attack on Sergei Skripal and his daughter in Salisbury, England, - Ruslan Boshirov. - is a decorated Russian agent named Anatoliy Chepiga, Bellingcat reported last month. The British government has not confirmed the names published by Bellingcat, but officials have not challenged the investigative group's findings. Bellingcat previously unmasked the other suspect as Col. Anatoly Chepiga, linking him as well to Russian military intelligence agency GRU.
One theory suggested by British intelligence was that Russian President Vladimir Putin wanted to publicly punish the two men for both fumbling their assignment and getting caught. There was no immediate comment on the Bellingcat report by either the Russian or British governments.
Petrov and Boshirov even appeared on Russian TV to say they were visiting Salisbury as tourists. They said they went to the city to visit its cathedral. After the two men were identified as suspects in the attack by British police, Putin said they were "civilians" and that there "was nothing criminal" involving them.
The poisoning of Skripal, a former Russian agent who was convicted of spying for Britain, became a major global incident.
Skripal and his daughter were found slumped on a park bench in Salisbury on March 4, a day after Yulia Skripal had arrived from Moscow to tell her father she planned to marry.More news: Windsor welcomes Princess Eugenie for royal wedding redux
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The attack left Skripal and Yulia critically ill, but Dawn Sturgess, 44, was later exposed to the same nerve agent and died in hospital.
The alleged poisonings caused fallout between Moscow and London, with many United Kingdom allies weighing in against the Kremlin.
According to the same source, Alexander Michkine was born on 13 July 1979 in this "small village (...) in the middle of nowhere" in Russian Federation.
Bellingcat said it obtained incomplete border crossing records showing Mishkin travelled - under his undercover persona of Petrov - multiple times to Ukraine between 2010 and 2013. For several years he used, inexplicably say analysts, the address of the GRU headquarters as his home address.
Releasing details about its latest findings on October 9, Bellingcat said that Aleksandr Mishkin was decorated at around the same time as Anatoly Chepiga in 2014 - the year Russian Federation seized Crimea and fomented separatism in eastern Ukraine, helping start a war that has killed more than 10,300 people.
His current military rank isn't known but Bellingcat speculates that, based on his 15-year service, he should be a lieutenant colonel or full colonel.
The researchers said that he was recruited by the GRU "at some point before 2003" and moved to Moscow in around 2009 where he adopted the identity of Alexander Petrov.
British, Dutch and US 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 USA presidential election.