A second Russian man accused of poisoning four people with novichok in Wiltshire has been named.
Investigative websites Bellingcat and The Insider, which is based in Russia, say the second suspect is called Dr Alexander Yevgenyevich Mishkin.
They say it is the real name of Alexander Petrov, who the British government named as one of their key suspects, alongside Ruslan Boshirov, whose real name was revealed to be Anatoliy Chepiga.
Here's what we know about Alexander Mishkin:
Dr Mishkin was born on 13 July 1979 in Loyga, in northern European Russia.
He studied and graduated from a military medical academy in Russia and then trained as a doctor for the Russian armed naval forces.
During his medical studies he was recruited by GRU, and by 2010 he had relocated to Moscow with a new alias and passport, as Alexander Petrov.
Bellingcat says Dr Mishkin travelled extensively between 2011 and 2018, to Ukraine and to the Transnistrian Republic, an unrecognised self-declared republic.
Unlike his counterpart, Dr Mishkin kept his biographical characteristics, retaining the same details in his cover of his birth date, his parents' first names, and his patronymic name of Yevgenyevich.
Until September 2014, Dr Mishkin's registered home address was Khoroshevskoe Shosse 76B - the Moscow headquarters of GRU.
In that month, he and Chepiga both moved into upscale apartments, according to Bellingcat.
Mishkin's military rank is unknown, but Bellingcat estimates he would be either a lieutenant colonel or a full colonel, based on military rank at graduation and his elapsed time of 15 years.
Bellingcat is to post a further report later this week.
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